Skeletal System Chapter 7-9

The nasal cavity is made up of two bones, the maxilla and the ethmoid bone. The maxilla forms the upper part of the nasal cavity, while the ethmoid bone forms the lower part. These two bones work together to provide structure and support to the nasal cavity.

The mandible consists of only one bone. It is the largest and strongest bone in the human face and forms the lower jaw. It is a single bone that articulates with the skull at the temporomandibular joint, allowing for movements like chewing and speaking.

The lacrimal consists of two bones.

The parietal bone is a singular bone that forms part of the skull. It is located on the top and sides of the head, forming the roof and sides of the cranial cavity. Therefore, the correct answer is 1, not 2 as stated in the given answer.

The occipital bone is a singular bone located at the back of the skull. It forms the base of the skull and helps protect the brain. Therefore, the correct answer is 1.

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The zygomatic bone, also known as the cheekbone, consists of two bones. These bones are located on either side of the face and contribute to the structure and shape of the face. They articulate with other bones such as the maxilla, frontal bone, and temporal bone. The zygomatic bones play a role in protecting the eye and supporting facial muscles.

The given answer is true because the pelvic girdles do consist of the pelvis, greater pelvis, false pelvis, and true pelvis. The pelvis is a bony structure that connects the spine to the lower limbs and provides support for the organs in the lower abdomen. The greater pelvis is the upper part of the pelvis, while the false pelvis refers to the space above the pelvic brim. The true pelvis is the lower, narrower part of the pelvis that contains the pelvic cavity and is involved in childbirth.

The question asks about the number of bones in the frontal. The frontal bone is a single bone located in the front part of the skull, forming the forehead. Therefore, the correct answer is 1.

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The ethmoid bone consists of only one bone.

The palatine consists of two bones.

The vomer is a bone that is located in the midline of the nasal cavity. It is a single bone that forms the lower part of the nasal septum.

Maxillae consist of two bones. The maxillae are a pair of facial bones that form the upper jaw and contribute to the structure of the face. They are the largest bones in the face and are essential for functions such as chewing, speaking, and supporting the teeth. Each maxilla bone is located on either side of the midline of the face and articulates with several other bones, including the nasal bones, zygomatic bones, and palatine bones. Therefore, the correct answer is 2.

The Inferior Nasal Conchae consist of two bones. These bones are located on the lateral walls of the nasal cavity and help to increase the surface area of the nasal cavity. They play a role in filtering, humidifying, and warming the air that enters the nasal cavity before it reaches the lungs.

The coxal bone is a large bone in the pelvis that consists of several parts, including the acetabulum, ilium, ischium, pubis, and symphysis pubis. Therefore, the statement that the coxal bone consists of these structures is true.

The shoulder girdles consist of the clavicles and scapula. The clavicles, also known as collarbones, are long bones that connect the sternum to the scapula. They provide support and help to keep the shoulders in proper alignment. The scapula, or shoulder blade, is a flat triangular bone located on the back of the shoulder. It connects the upper arm bone (humerus) to the collarbone and provides attachment points for various muscles involved in shoulder movement. Together, the clavicles and scapula form the shoulder girdles, which play a crucial role in the stability and movement of the shoulders.

The coronal suture, sagittal suture, lambdoidal suture, and squamosa suture are all areas where the cranial bones of the skull come together. These sutures form the joints between the different bones of the skull, allowing for flexibility and growth during development. They also provide stability and protection for the brain.