MCQs 200 Oral Histology,Dr.Seng Leakhana
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Questions and Answers
- 1.
The oral mucosa ចែកចេញជា:
- A.
ពីរស្រទាប់ epithelium and connective tissue
- B.
បីស្រទាប់ epithelium, connective tissue and lamina propria
- C.
បួនស្រទាប់ epithelium, connective tissue, lamina propria and corium
- D.
បួនស្រទាប់ epithelium, basal layer, connective tissue and corium
Correct Answer
A. ពីរស្រទាប់ epithelium and connective tissueExplanation
The correct answer is "epithelium and connective tissue" because the oral mucosa is composed of two layers: the epithelium, which is the outermost layer that provides protection, and the connective tissue, which lies beneath the epithelium and supports the mucosa.Rate this question:
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- 2.
Granular layer មាននៅក្នុងៈ
- A.
Keratinized, Para-keratinized and Ortho-keratinized epithelium
- B.
Non-keratinized epithelium
- C.
Keratinized epithelium
- D.
Para-keratinized epithelium
Correct Answer
A. Keratinized, Para-keratinized and Ortho-keratinized epithelium -
- 3.
Basement membrane នៅចន្លោះ
- A.
Epithelium and lamina propria
- B.
Epithelium and submucosa
- C.
Epithelium and Bone
- D.
Lamina propria and submucosa
Correct Answer
A. Epithelium and lamina propriaExplanation
The basement membrane is a thin, fibrous layer that separates the epithelium (the outermost layer of cells) from the underlying connective tissue. The lamina propria is a layer of loose connective tissue found beneath the basement membrane. Therefore, the correct answer is "Epithelium and lamina propria" because these two layers are separated by the basement membrane.Rate this question:
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- 4.
Taste buds are in
- A.
Tongue
- B.
Hard palate
- C.
Soft palate
- D.
Teeth
Correct Answer
A. TongueExplanation
Taste buds are located on the tongue, which is a sensory organ responsible for detecting taste. The tongue contains numerous papillae, tiny structures that house taste buds. These taste buds are specialized cells that can detect different flavors such as sweet, salty, sour, and bitter. They send signals to the brain, allowing us to perceive and differentiate tastes. Therefore, the correct answer is tongue.Rate this question:
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- 5.
Specialized cells stem from
- A.
Basal layer and prickle cell layer
- B.
Granular layer
- C.
Cornified layer
- D.
Basement membrane
Correct Answer
A. Basal layer and prickle cell layerExplanation
Specialized cells stem from the basal layer and prickle cell layer. The basal layer is the innermost layer of the epidermis, where cells constantly divide and differentiate to replace the outer layers. The prickle cell layer is located above the basal layer and consists of cells that have started to develop specific characteristics. These layers contain stem cells that have the ability to differentiate into various specialized cell types, such as keratinocytes, melanocytes, and Langerhans cells, which are essential for the functioning of the skin.Rate this question:
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- 6.
Specialized cells migrate
- A.
To the upper layers
- B.
To the lower layer
- C.
To basement membrane
- D.
To lamina propria
Correct Answer
A. To the upper layersExplanation
Specialized cells migrate "to the upper layers" in order to perform their specific functions effectively. This migration allows them to be closer to the surface of the tissue or organ where they can interact with other cells or substances. By being in the upper layers, these cells can also receive necessary nutrients and oxygen more efficiently. Additionally, migrating to the upper layers may be necessary for these cells to differentiate into their mature forms and carry out their specialized tasks.Rate this question:
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- 7.
Keratohyalin granules are present in
- A.
Granular layer and prickle cell layer
- B.
Basal layer and prickle cell layer
- C.
Cornified layer
- D.
Basement membrane
Correct Answer
A. Granular layer and prickle cell layerExplanation
Keratohyalin granules are present in the granular layer and prickle cell layer of the skin. These granules play a crucial role in the process of keratinization, where the cells in these layers undergo structural changes and produce keratin, a tough protein that helps protect the skin. The granules contain important proteins and enzymes that contribute to the formation of the skin's barrier function and help maintain its integrity.Rate this question:
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- 8.
Stenon’s duct is of:
- A.
Parotide gland
- B.
Sub-mandibular gland
- C.
Sub-lingual gland
- D.
Minor gland
Correct Answer
A. Parotide glandExplanation
Stenon's duct is a duct that originates from the parotid gland, which is the largest salivary gland located in front of the ear. This duct carries saliva from the parotid gland to the mouth, specifically to the inside of the cheek. Therefore, the correct answer is "Parotide gland."Rate this question:
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- 9.
Wharton’s duct is of:
- A.
Sub-mandibular gland
- B.
Parotide gland
- C.
Sub-lingual gland
- D.
Minor gland
Correct Answer
A. Sub-mandibular glandExplanation
Wharton's duct is a duct that is associated with the submandibular gland. This gland is located beneath the mandible and is responsible for producing saliva. Wharton's duct is responsible for carrying the saliva from the submandibular gland to the mouth, allowing for proper lubrication and digestion.Rate this question:
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- 10.
Bartholin’s duct is of:
- A.
Sub-lingual gland
- B.
Parotide gland
- C.
Sub-mandibular gland
- D.
Minor gland
Correct Answer
A. Sub-lingual glandExplanation
Bartholin's duct is a small duct located near the opening of the vagina in females. It is responsible for carrying fluid from the Bartholin's gland, which is located on either side of the vaginal opening. The Bartholin's gland produces lubricating fluid to aid in sexual intercourse. Therefore, the correct answer is Sub-lingual gland.Rate this question:
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- 11.
Von Ebner’s salivary gland is:
- A.
Minor gland
- B.
Parotide gland
- C.
Sub-mandibular gland
- D.
Sub-lingual gland
Correct Answer
A. Minor glandExplanation
Von Ebner's salivary gland is a minor gland. Unlike the parotide, sub-mandibular, and sub-lingual glands, Von Ebner's gland is not one of the major salivary glands. It is a small gland located beneath the circumvallate papillae on the surface of the tongue. Its main function is to secrete lingual lipase, an enzyme that aids in the digestion of fats.Rate this question:
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- 12.
Function of acini is:
- A.
To produce saliva
- B.
To produce hormone
- C.
To produce histamine
- D.
To produce gastric acid
Correct Answer
A. To produce salivaExplanation
The function of acini is to produce saliva. Saliva plays a crucial role in the digestion process as it helps in moistening and lubricating food, making it easier to swallow. Additionally, saliva contains enzymes that begin the breakdown of carbohydrates, aiding in the digestion of food. Therefore, the production of saliva is the primary function of acini.Rate this question:
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- 13.
Lumen is:
- A.
A cental opening of an acini
- B.
A central opening of an oral cavity
- C.
A central opening of a tooth
- D.
A central opening of a gland
Correct Answer
A. A cental opening of an aciniExplanation
The lumen refers to the central opening of an acini. An acini is a small, rounded structure found in certain organs, such as the pancreas and salivary glands. The lumen serves as a passageway for substances to flow through within the acini. This allows for the secretion and transportation of various substances, such as digestive enzymes or saliva, to the appropriate locations within the body.Rate this question:
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- 14.
Myoepithelial cell of an acini is:
- A.
Kind of contractile cell on an acini
- B.
Kind of cell in a salivery gland
- C.
Kind of cell in a heart
- D.
Kind of cell in a tonsil
Correct Answer
A. Kind of contractile cell on an aciniExplanation
A myoepithelial cell is a type of contractile cell found in the acini. Acini are small sac-like structures found in various glands, such as the salivary glands. These myoepithelial cells have the ability to contract and help in the secretion of substances from the acini. They surround the acini and are responsible for pushing the secretions out of the gland. Therefore, the correct answer is that myoepithelial cells are a kind of contractile cell on an acini.Rate this question:
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- 15.
Intercalated duct is :
- A.
A duct from acinus
- B.
A duct from a salivery gland
- C.
A duct from a lumen
- D.
A duct from a paritide gland
Correct Answer
A. A duct from acinusExplanation
The intercalated duct is a type of duct that originates from the acinus. The acinus is a small, grape-like structure found in various glands, including salivary glands. It is responsible for producing and secreting fluids. Therefore, the intercalated duct carries these fluids from the acinus to other parts of the gland or the lumen, which is the central cavity of a tubular structure. It is not specifically associated with a parotid gland, which is a type of salivary gland.Rate this question:
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- 16.
Striated duct is:
- A.
A duct from intercalated ducts
- B.
A duct from a salivery gland
- C.
A duct from a system duct
- D.
A duct from a submandibular gland
Correct Answer
A. A duct from intercalated ductsExplanation
The striated duct is a type of duct that originates from the intercalated ducts. Intercalated ducts are small ducts found in the exocrine glands, such as salivary glands, that connect the secretory units of the gland to the larger system ducts. The striated ducts are responsible for modifying the composition of the fluid produced by the secretory units before it is released into the system ducts.Rate this question:
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- 17.
Excretory duct is
- A.
A duct from a striated ducts
- B.
A duct from a parotide gland
- C.
A duct from a submandibular gland
- D.
A duct from a sublimgual gland
Correct Answer
A. A duct from a striated ductsExplanation
The given answer is incorrect. The options provided in the question are all different types of ducts, but none of them are "a duct from a striated ducts." Therefore, the correct answer cannot be determined based on the given options.Rate this question:
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- 18.
នៅក្នុងមាត់ មាន Tosils អ្វីខ្លះ:
- A.
All are corrects
- B.
Pharyngeal tonsil
- C.
Tubal tonsil
- D.
Palatine tonsils and Lingual tonsil
Correct Answer
A. All are correctsExplanation
All of the options listed are correct. The tonsils mentioned in the question are the pharyngeal tonsil, tubal tonsil, palatine tonsils, and lingual tonsil. These are all different types of tonsils found in the human body. The pharyngeal tonsil is located in the back of the throat, the tubal tonsil is located near the opening of the Eustachian tube, the palatine tonsils are the ones commonly referred to as "tonsils" and are located on either side of the back of the throat, and the lingual tonsil is located at the base of the tongue.Rate this question:
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- 19.
ទីតាំងរបស់ Tubal tonsil គឺៈ
- A.
នៅខាងក្រោយនៃ opening of Eustachian tube គឺនៅក្នុង Nasopharynx
- B.
នៅលើ Pharynx
- C.
នៅលើ Larynx
- D.
នៅលើ Palate
Correct Answer
A. នៅខាងក្រោយនៃ opening of Eustachian tube គឺនៅក្នុង NasopharynxExplanation
The tubal tonsil is located at the back of the opening of the Eustachian tube, which is situated in the nasopharynx. It is not found in the pharynx, larynx, or palate.Rate this question:
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- 20.
ទីតាំងរបស់ Pharyngeal tonsil គឺៈ
- A.
នៅខាងលើនិងខាងក្រោយកន្លែងបត់នៃរន្ធច្រមុះទៅក្នុង Nasopharynx
- B.
នៅលើ Pharynx
- C.
នៅលើ Larynx
- D.
នៅលើ Palate
Correct Answer
A. នៅខាងលើនិងខាងក្រោយកន្លែងបត់នៃរន្ធច្រមុះទៅក្នុង NasopharynxExplanation
The correct answer is that the location of the pharyngeal tonsil is above and behind the opening of the nasal cavity into the throat, in the nasopharynx. It is not located on the larynx or palate.Rate this question:
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- 21.
Vesicle គឺជា
- A.
ពងទឹក
- B.
ពងខ្ទុះ
- C.
ពងទឹកលាយខ្ទុះ
- D.
ពងទឹកលាយឈាម
Correct Answer
A. ពងទឹក -
- 22.
Bulla
- A.
Large vesicles that are confluent
- B.
Vesicle
- C.
Large pustule
- D.
Large lesion
Correct Answer
A. Large vesicles that are confluentExplanation
The correct answer is "Large vesicles that are confluent." This means that the vesicles are not individual or separate, but rather they have merged together to form a larger, continuous structure. This can be seen as a characteristic feature of certain skin conditions or infections, where multiple vesicles cluster together and create a larger lesion.Rate this question:
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- 23.
Atrophy គឺជា៖
- A.
Lack of nutrition for cells
- B.
Acute inflammation
- C.
Chronic inflammation
- D.
Lack of oxygen for cells
Correct Answer
A. Lack of nutrition for cellsExplanation
Atrophy refers to the shrinking or wasting away of cells, tissues, or organs due to a lack of nutrition. When cells do not receive adequate nutrients, they are unable to function properly and may begin to deteriorate. This can result in reduced cell size and function, ultimately leading to atrophy. Acute and chronic inflammation, as well as a lack of oxygen, can cause damage to cells, but they are not specifically related to the lack of nutrition that causes atrophy.Rate this question:
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- 24.
Hypertrophy គឺជា៖
- A.
Increase in size of an organ
- B.
Increase in cell number of an organ
- C.
Decrease in size of an organ
- D.
Decrease in cell number of an organ
Correct Answer
A. Increase in size of an organExplanation
Hypertrophy refers to the increase in size of an organ. This can occur due to an increase in the size of individual cells within the organ, without an increase in the number of cells. It is a physiological response to increased demand or stress on the organ, such as exercise-induced muscle hypertrophy. Hypertrophy can also occur as a compensatory mechanism in response to injury or disease, where the remaining cells increase in size to compensate for the loss of tissue. Overall, hypertrophy leads to an enlargement of the organ without an increase in the number of cells.Rate this question:
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- 25.
Hyperplasia គឺជា៖
- A.
Increase in cell number of an organ or tissue
- B.
Increase in size of an organ or tissue
- C.
Decrease in size of an organ
- D.
Decrease in cell number of an organ
Correct Answer
A. Increase in cell number of an organ or tissueExplanation
Hyperplasia refers to an increase in the number of cells in an organ or tissue. This can occur due to various factors such as hormonal imbalance, chronic irritation, or increased demand for tissue regeneration. It is a physiological response aimed at increasing the functional capacity of the organ or tissue. Hyperplasia can be seen in various conditions such as benign prostatic hyperplasia, endometrial hyperplasia, or liver regeneration after partial hepatectomy. It is important to note that hyperplasia is a controlled process and should not be confused with neoplasia, which is the uncontrolled growth of cells seen in cancer.Rate this question:
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- 26.
Displasia គឺជា៖
- A.
Disorder of cell in mitosis
- B.
Disorder of cell structure formation
- C.
Disorder of cell distribution
- D.
Disorder of cell in migration
Correct Answer
A. Disorder of cell in mitosisExplanation
The correct answer is "Disorder of cell in mitosis". Displasia refers to the abnormal development or growth of cells, specifically during the process of mitosis. During mitosis, cells divide and replicate their genetic material to form two identical daughter cells. However, in cases of displasia, there is a disruption or disorder in this process, leading to abnormal cell division and potentially resulting in the formation of abnormal tissue or tumors.Rate this question:
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- 27.
Taste buds មិនមាននៅក្នុង៖
- A.
Filiform papillae
- B.
Circumvallate papillae
- C.
Fungiform papillae
- D.
Foliate papillae
Correct Answer
A. Filiform papillaeExplanation
Filiform papillae are small, cone-shaped structures on the surface of the tongue that do not contain taste buds. Unlike other types of papillae, such as circumvallate, fungiform, and foliate papillae, filiform papillae do not have taste receptors. Instead, they play a role in the texture and manipulation of food, helping to move it around the mouth and aiding in the process of chewing and swallowing. Therefore, it is correct to say that taste buds are not present in filiform papillae.Rate this question:
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- 28.
Sulcular epithelium is formed of:
- A.
Nonkeratinized stratified squamous epithelium.
- B.
Parakeratinized stratified squamous epithelium.
- C.
Orthokeratinized stratified squamous epithelium.
- D.
Columnar epithelium.
Correct Answer
A. Nonkeratinized stratified squamous epithelium.Explanation
Sulcular epithelium is the tissue that lines the gingival sulcus, which is the space between the tooth and the surrounding gum tissue. It is a nonkeratinized stratified squamous epithelium, meaning that it consists of multiple layers of flat cells without a layer of dead, hardened cells on the surface. This type of epithelium is found in areas of the body that require flexibility and moisture, such as the oral mucosa. It helps to protect the underlying tissues and provides a barrier against bacteria and other irritants.Rate this question:
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- 29.
Which of the following is a wrong statement about the dentogingival junction:
- A.
Its epithelial cells are keratinized stratified squamous.
- B.
It has an epithelial and a connective tissue component.
- C.
It shifts apically with age.
- D.
Its coronal end corresponds to the bottom of the gingival sulcus.
Correct Answer
A. Its epithelial cells are keratinized stratified squamous.Explanation
The dentogingival junction is the area where the tooth surface meets the gingival tissue. It consists of both an epithelial component and a connective tissue component. The epithelial cells in this region are not keratinized stratified squamous, which is a characteristic of the oral mucosa. Instead, the epithelial cells at the dentogingival junction are non-keratinized. Therefore, the statement that the dentogingival junction has keratinized stratified squamous epithelial cells is incorrect.Rate this question:
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- 30.
Keratinized epithelium differs from nonkeratinized epithelium in that:
- A.
It contains granular cell layer.
- B.
.
- C.
Contain a higher glycogen content.
- D.
It does not contain basal lamina.
Correct Answer
A. It contains granular cell layer.Explanation
Keratinized epithelium differs from nonkeratinized epithelium because it contains a granular cell layer. This granular cell layer is responsible for the production of keratin, a tough protein that helps protect the underlying tissues. Nonkeratinized epithelium, on the other hand, lacks this granular cell layer and does not produce keratin.Rate this question:
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- 31.
The buccal mucosa:
- A.
It is firmly attached to the underlying tissues.
- B.
Has a keratinized epithelium.
- C.
Is continuous with the gingival mucosa.
- D.
Has numerous connective tissue papillae.
Correct Answer
A. It is firmly attached to the underlying tissues.Explanation
The buccal mucosa is the lining of the inner cheek. It is firmly attached to the underlying tissues, which provides stability and support to the cheek. This attachment helps to maintain the shape and structure of the buccal mucosa. The firm attachment also allows for proper functioning of the cheek, such as facilitating speech and chewing.Rate this question:
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- 32.
Masticatory mucosa has:
- A.
Elastic fibers in its blood vessels wall.
- B.
Elastic fibers in its lamina propria.
- C.
Stratum corneum.
- D.
No connective tissue papillae.
Correct Answer
A. Elastic fibers in its blood vessels wall.Explanation
Masticatory mucosa is a specialized type of oral mucosa found in areas of the mouth that are subjected to significant mechanical stress, such as the gingiva and hard palate. One of the distinguishing features of masticatory mucosa is the presence of elastic fibers in its blood vessel walls. These elastic fibers provide elasticity and flexibility to the blood vessels, allowing them to withstand the forces exerted during chewing and other oral activities. This helps to maintain the integrity and function of the masticatory mucosa in these high-stress areas of the mouth.Rate this question:
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- 33.
Which of the following is true of the sulcular epithelium:
- A.
Is nonkeratinized.
- B.
Consists of keratinized epithelium.
- C.
Has submucosa.
- D.
Contain connective tissue papillae.
Correct Answer
A. Is nonkeratinized.Explanation
The sulcular epithelium is a type of oral epithelium that lines the gingival sulcus, which is the space between the tooth surface and the surrounding gum tissue. It is nonkeratinized, meaning that it does not have a layer of keratin on its surface. This is important because the nonkeratinized nature of the sulcular epithelium allows for the exchange of fluids and nutrients between the gingival sulcus and the underlying connective tissue.Rate this question:
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- 34.
Parakeratinized epithelium is found in:
- A.
Gingiva.
- B.
Vestibular fornix.
- C.
Floor of the mouth.
- D.
Ventral surface of tongue.
Correct Answer
A. Gingiva.Explanation
Parakeratinized epithelium refers to a type of epithelial tissue that has partially lost its nucleus and has an abnormal keratinization process. It is commonly found in the gingiva, which is the gum tissue surrounding the teeth. The presence of parakeratinized epithelium in the gingiva helps to provide a protective barrier against mechanical stress and microbial invasion. This type of epithelium is also found in other oral structures such as the vestibular fornix, floor of the mouth, and ventral surface of the tongue, but the gingiva is the most prominent location.Rate this question:
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- 35.
In which area the connective tissue papillae are long & numerous?:
- A.
Gingiva.
- B.
Buccal mucosa.
- C.
Alveolar mucosa.
- D.
Floor of the mouth.
Correct Answer
A. Gingiva.Explanation
The connective tissue papillae are long and numerous in the gingiva.Rate this question:
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- 36.
The mucogingival junction is the junction of:
- A.
Alveolar mucosa and attached gingiva.
- B.
Sulcular epithelium & free gingiva.
- C.
Free gingiva and attached gingiva.
- D.
.
Correct Answer
A. Alveolar mucosa and attached gingiva.Explanation
The mucogingival junction refers to the boundary between the alveolar mucosa and the attached gingiva. The alveolar mucosa is the thin, movable tissue that covers the underlying bone, while the attached gingiva is the firm, tightly adherent tissue that surrounds the teeth. This junction is important for maintaining the stability and health of the gingival tissues.Rate this question:
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- 37.
The mucosa of the dorsal surface of the tongue is:
- A.
Spesialized mucosa.
- B.
.
- C.
Masticatory mucosa.
- D.
Linning mucosa.
Correct Answer
A. Spesialized mucosa.Explanation
The correct answer is "Specialized mucosa." The mucosa of the dorsal surface of the tongue is specialized because it contains papillae, taste buds, and lingual tonsils, which are not found in other areas of the oral cavity. This specialized mucosa is responsible for the sense of taste and plays a crucial role in the process of mastication and swallowing.Rate this question:
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- 38.
Which of the following represents the correct innervation of fungiform papilla?:
- A.
Chorda tympani.
- B.
Facial nerve.
- C.
Trigeminal nerve.
- D.
Glossopharyngeal nerve.
Correct Answer
A. Chorda tympani.Explanation
The correct innervation of fungiform papilla is through the Chorda tympani. The Chorda tympani is a branch of the facial nerve that carries taste information from the anterior two-thirds of the tongue, including the fungiform papillae. The Trigeminal nerve provides general sensation to the tongue, while the Glossopharyngeal nerve innervates the posterior one-third of the tongue.Rate this question:
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- 39.
Which of the following appears to play an important role in attachment of its cells:
- A.
Desmosomes.
- B.
Keratohyaline granules.
- C.
Glycogen contents.
- D.
Lysosomes.
Correct Answer
A. Desmosomes.Explanation
Desmosomes are specialized cell structures that play a crucial role in cell adhesion. They are responsible for attaching cells together, providing mechanical strength and stability to tissues. Desmosomes consist of proteins called desmogleins and desmocollins, which form strong connections between adjacent cells. These connections help to prevent cells from being easily separated, allowing tissues to withstand mechanical stress. Therefore, desmosomes appear to be the most likely structure to play an important role in cell attachment.Rate this question:
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- 40.
The structure of the oral mucosa is:
- A.
Epithelium, lamina propria and basement membrane.
- B.
Epithelium and basement membrane.
- C.
Mucosa & submucosa.
- D.
Epithelium, lamina propria and muscular layer.
Correct Answer
A. Epithelium, lamina propria and basement membrane.Explanation
The correct answer is "Epithelium, lamina propria and basement membrane." This is because the oral mucosa is composed of three layers: the epithelium, which is the outermost layer and provides protection; the lamina propria, which is the connective tissue layer that supports the epithelium; and the basement membrane, which separates the epithelium from the lamina propria. This structure is important for maintaining the integrity and function of the oral mucosa.Rate this question:
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- 41.
Healthy line is represented in:
- A.
Mucogingival junction.
- B.
Free gingival groove.
- C.
Junction of the palatine gingiva and the lateral surface of the palate.
- D.
Junction of the buccal and labial mucosa.
Correct Answer
A. Mucogingival junction.Explanation
The healthy line is represented in the mucogingival junction. This is the area where the gingiva (gums) and the attached mucosa (lining of the mouth) meet. It is an important landmark in dentistry as it helps to determine the health and stability of the gums.Rate this question:
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- 42.
Fungiform papillae:
- A.
Carry taste buds.
- B.
Are seen as white spots.
- C.
Have a stratum corneum.
- D.
.
Correct Answer
A. Carry taste buds.Explanation
Fungiform papillae are small mushroom-shaped structures found on the surface of the tongue. They are responsible for carrying taste buds, which detect different tastes such as sweet, sour, bitter, and salty. These papillae are not seen as white spots and do not have a stratum corneum, which is the outermost layer of the skin.Rate this question:
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- 43.
Which of the following is true regarding the dentogingival junction?:
- A.
It moves apically with age.
- B.
It is derived entirely from ectomesenchyme.
- C.
It moves occlusally with age.
- D.
Contains clear submucosa.
Correct Answer
A. It moves apically with age.Explanation
The dentogingival junction refers to the area where the tooth surface meets the gum tissue. As a person ages, the dentogingival junction tends to move apically or towards the root of the tooth. This is due to factors such as gum recession, which is a common occurrence with age. Therefore, the statement that "It moves apically with age" is true.Rate this question:
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- 44.
Which of the following regions has a nonkeratinized epithelium and is loosely attached to the underlying structures?:
- A.
Vestibular fornix.
- B.
Buccal mucosa.
- C.
Attached gingiva.
- D.
Hard palate.
Correct Answer
A. Vestibular fornix.Explanation
The vestibular fornix is a region that has a nonkeratinized epithelium and is loosely attached to the underlying structures. This means that the epithelial cells in this region do not have a tough, protective layer of keratin, and the tissue is not tightly bound to the structures beneath it. This loose attachment allows for greater flexibility and movement in the area. In contrast, the buccal mucosa, attached gingiva, and hard palate all have a keratinized epithelium and are more firmly attached to the underlying structures.Rate this question:
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- 45.
The floor of the mouth is lined by:
- A.
Linning mucosa loosely attached.
- B.
Linning mucosa firmly attached.
- C.
Specialized mucosa.
- D.
Masticatory mucosa.
Correct Answer
A. Linning mucosa loosely attached.Explanation
The correct answer is "Linning mucosa loosely attached." The floor of the mouth is lined by a type of mucosa that is loosely attached. This type of mucosa allows for flexibility and movement in the mouth, which is necessary for functions such as speaking and swallowing. It also helps to protect the underlying structures and provides moisture to keep the mouth lubricated.Rate this question:
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- 46.
Keratohyaline granules in epithelial cells of keratinized mucosa are associated with:
- A.
Stratum granulosum.
- B.
The tonofilaments.
- C.
Prickle cell layer.
- D.
Basal cell layer.
Correct Answer
A. Stratum granulosum.Explanation
The correct answer is Stratum granulosum. Keratohyaline granules are found in the stratum granulosum, which is the layer of the epidermis located above the basal cell layer. These granules play a role in the production of keratin, a protein that helps to strengthen and waterproof the skin. The presence of keratohyaline granules in the stratum granulosum is an important characteristic of keratinized mucosa.Rate this question:
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- 47.
20 Which of the following contributes to the reddish coloration of the vermilion border?:
- A.
Vascularity of the lamina propria.
- B.
Thichness of oral epithelium.
- C.
Existance of high number of langerhans cells.
- D.
Epithelial keratinization.
Correct Answer
A. Vascularity of the lamina propria.Explanation
The reddish coloration of the vermilion border is primarily due to the vascularity of the lamina propria. The lamina propria is a layer of connective tissue beneath the epithelium that contains numerous blood vessels. These blood vessels supply oxygenated blood to the area, resulting in the reddish appearance. The other options, such as the thickness of the oral epithelium, existence of a high number of Langerhans cells, and epithelial keratinization, do not directly contribute to the reddish coloration of the vermilion border.Rate this question:
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- 48.
Which of the following are not usually found in the keratinocytes of the stratum spinosum of keratinized oral epithelium?:
- A.
Keratohyaline granules.
- B.
Tonofibrils.
- C.
Membrane coating granules.
- D.
Ribosomes.
Correct Answer
A. Keratohyaline granules.Explanation
Keratohyaline granules are not usually found in the keratinocytes of the stratum spinosum of keratinized oral epithelium. This is because keratohyaline granules are typically found in the granular layer (stratum granulosum) of the epidermis, which is located above the stratum spinosum. The stratum spinosum is primarily composed of keratinocytes connected by desmosomes, and it is responsible for providing strength and stability to the epithelium. Keratohyaline granules, on the other hand, play a role in the synthesis of keratin and the formation of the skin barrier in the upper layers of the epidermis. Therefore, they are not usually present in the keratinocytes of the stratum spinosum.Rate this question:
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- 49.
The sulcular epithelium:
- A.
Is nonkeratinized.
- B.
Is keratinized.
- C.
Has thick epithelial layer.
- D.
Has long epithelial ridges.
Correct Answer
A. Is nonkeratinized.Explanation
The sulcular epithelium refers to the epithelial lining of the gingival sulcus, which is the space between the tooth surface and the gum tissue. This epithelium is nonkeratinized, meaning it lacks a tough outer layer of keratin. Instead, it has a thin, delicate structure that is more susceptible to damage and infection. This nonkeratinized nature allows for easier exchange of fluids and cells between the gingival sulcus and the underlying connective tissue.Rate this question:
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- 50.
Taste buds are not found on:
- A.
Filliform papillae.
- B.
Fungiform papillae.
- C.
Foliate papillae.
- D.
Circumvallate papillae.
Correct Answer
A. Filliform papillae.Explanation
Taste buds are sensory organs that are responsible for detecting different tastes. They are mainly found on the fungiform, foliate, and circumvallate papillae, which are structures on the surface of the tongue. Filliform papillae, on the other hand, do not contain taste buds. They are smaller and more numerous than the other types of papillae and are involved in tactile sensation rather than taste perception.Rate this question:
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