Development and Histology Of The Ear (Msq Drill 272)

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1. Where do the middle and external ear develop from?

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2. Most of the fibers in cranial nerve 8 are

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3. How many semicircular canals are there?

Explanation

superior, posterior and lateral

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4. The rest of the ear is filled with

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5. The bony labyrith and the membranous labyninth are parts of the

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6. The vestibule, semicircular canals and    ---------- are parts of the bony labyrith.

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7. In which structure is the organ of corti?

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8. A tuft of motile cillia and 1 immotile cillium called a kinocillium is seen on this cell.

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9. The cochlea ductt (scala media)  is in the middle of the scala vestibuli and

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10. What are the two types of hair cells in the organ of corti: Check all that apply.

Explanation

inner row has a single row from base to apex, outer hair cells - 3 rows

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11. The space between the product of the otic vesicle and the bony wall is filled with

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12. What fluid is between the membranous labyrinth and the bony labyrinth. This fluid is similar to CSF.?

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13. The hearing receptors are found in which structure?

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14. The tubular protion spirals around to form the

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15. The saccule and utricle are part of the

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16. Which hair cell type is this? Flask shaped, surrounded by a cup shaped afferent nerve ending called a chalyx.

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17. What is the inner ear structure for hearing

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18. The membranous labyrynth is fillled with

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19. Dendrites of which cranial nerve are found in the macula of the utricule and saccule?

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20. What is the layer of gelatinous glycoprotein that lines the cristae ampulla?

Explanation

The cupulla sort of acts like a flap. It is moved by fluid movement. When you move the head the fluid in the semicircular canals moves and pushes against the cupula. There are stereociliar cells in the cupula. Movement of the cupula causes depol or hyperpol of the sterociliar cells.

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21. Which of the hair cells in the organ of corti are responsible for sound?

Explanation

the outer hair cells are more modulatory

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22. What is the name of the structure  that the inner ear develops from?

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23. Part of the otic vesicle is absorbed by the_______ during the 5th week.

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24. The spiral ligament and bony canal are of __________ origin

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25. The malleus and the incus are from the

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26. The external auditory canal forms from the

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27. What is the function of the cristae ampullaris?

Explanation

The maculae are static.

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28. How many types of hair cells are there?

Explanation

The hair cell types have process of of bipolar neurons from the basal ganglia in the vestibule. The arrangement of these processes on the hair cells is different between these two types. Some these are efferent and some are afferent.

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29. The cocchlea duct is also known as the

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30. What transmits proprioceptive information to the brain via the vestibular division of the cranial nerve 8 regarding the position and movement of the head - i.e. equilibrium.

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31. The internal ear is derived from the

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32. What are the two portions of cranial nerve 8?

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33. What surrounds the whole structure of the ear that eventually becomes the bony structure of the ear?

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34. The neurons that are found in the modiolus are also known as

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35. The macule of the utrice and saccule both consist of neuroepithelial cells covered by an otolitic membrane made up of a layer gelatinous glycoprotein and crystals/stones of ______ .

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36. The receptors on the hair cells are mechanoreceptors. Sound waves are transduced into

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37. The external ear comes from branchial arches 1 and 2.  1 gives rise to the anterior helix and 2 gives rise to the

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38. The structure between the stapes and the opening into the otic capsule is the ______ window.

Explanation

2 layer of epithelium and 1 layer of ectoderm

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39. The ventral protion of the tube known as the saccula develops a _______ outgrowth

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40. The tympanic cavity is _______ filled

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41. The transduction mechanism in the ear starts with the gelatinous material overlying the

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42. What membrane sits on top of the hair cells in the organ of corti?

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43. When the hair cells in the organ of corti are pushed towards the lateral wall after the basement membrane has deflected what occurs, depolarization or hyperpolarization?

Explanation

The afferent nerves are located on the inner hair cells. The outer hair cells are innervated by the efferent nerves. The outer are more modulatory.

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44. All the derivatives of the otic vesicle are filled with

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45. What bone sits on the tympanic membrane?

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46. The cocchlea associates with the ______

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47. The cochlear consists of a central pillar called a  _______ around which a hollow bony tube makes spiral turns.

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48. Endolymph is rich in

Explanation

It is similar to intracellular fluid.

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49. The sensory epithelium of the macula in the utricle is lined with

Explanation

Stereocilia are also found in the crista ampularis as well. The sensory cells are in descrete areas otherwise the rest of the wall is simple cuboidal.

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50. What is the membrane that divides the scala tympani from the scala media (cocchlea duct?)

Explanation

The vestibular membrane divides the scala vestibular from the scala media.

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51. What are the structures that produce endolymph and are found in the lateral wall of the scala media or cocchlea duct?

Explanation

This is the only vascularized epithelium in the ear. Most of the endolymph in the membranous labyrinth is produced here.

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52. The eustachian tube is formed from the

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53. Is transmission of auditory information to the brain via the cochlear division another function of the internal ear or middle ear

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54. The middle ear cavity is continuous with the

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55. The efferent pathway of the ear is there as a

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56. The perilymph drains out of the bonylabyrith chamber into which space?

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57. Do the three parts of the ear develop together or separately?

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58. The membranous labyrinth is suspended in

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59. The scala vestibuli and scala tympani are continuous with each other at the

Explanation

The scala tympani is continuous with the round window.

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60. Do the hair cells in the organ of corti have kinocillium?

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61. High frequency sound will be integrated at the ____ of the cocchlea due to the thinning out of the basement membrane towards the helicotrema.

Explanation

low frequency sound is at the apex. this is reason for the tonotopic arrangement.

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62. The adsorption focus take on the shape of the

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63. How many communications exist between the inner ear and outer ear?

Explanation

pressure to the oval window is equalized by pressure of the round window

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64. The membranous labyrinth is from the

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65. Are the cells for auditory and balance senses similar?

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66. What is the hardest bone inside the skull?

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67. What is the thin attachement between the cocchlea duct and the saccule?

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68. Deflection away from the kinocillium or longer stereocillia hair cell leads to

Explanation

If deflection is towards the kinocillium the subsequent rate of action potential will be higher or the cell will depolarize.

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69. The auditory receptor or hair cell in the spiral organ of corti sits on top of the

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70. The second pharyngeal arch has cranial nerve _____ . The stapes is also from of this arch.

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71. At the end of the external ear canal there is a plug of ______ during development.

Explanation

As the fetus develops the tissue dissapears and the mesoderm in the top of the tympanic cavity also dissapears

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72. The cavity between the inner ear and middle ear is the

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73. Fluid in this part of the cochlea is deflected after the stapes pushes on the oval window.

Explanation

Fluid is deflected in this route. Scala vestibuli to helicotrema to scala tympani. This is perilymph.

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74. Where do the external auditory meatus and canal come from?

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75. The middle ear is derived from the

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76. _____ surround inner ear structures

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77. Stratified squamous epithelium lines the outisde of this structure.

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78. The nerve to the inner ear develps from the neural crest cells: true or false

Explanation

It is thought to develop from ectoderm.

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79. The inner ear starts to develop at day

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80. The second arch cartillage is going to give rise to the

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81. The spiral ligament that starts at the end of the modiolus is of _______ placode origin.

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82. The cristae ampularis is found in the base of the

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83. Neurons in the ear developed from the ectoderm, they are located in the spongy bony area called the

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84. The ______ transmits information about the position of the head in space.

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85. The lining on the inside of the cochlea and vestibular system is derived from the

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86. During which week does the otic vesicle separate into the endolymphatic sac, utricular and saccular portions?

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87. The eustachian tube was the

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88. What layer does the ear develop from?

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89. The typmanic membrane is from: Check all that apply.

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90. What is the fluid that is initially displaced by the stapes & which pushes back on the round window?

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91. The endolymph sac sits in the 

Explanation

The fluid is emptied into that subdural space.

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92. The tympanic membrane has an outer layer of statified squamous epithelium outside and simple squamous inside due the presense of ectoderm outside and ____ inside

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93. Outside of the sensory regions the membranous labyrinth is simple cuboidal but everywhere else those regions form sensory regions which have

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94. Maculae are found in

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95. When the stereociliar are resting is there an action potential on the afferent nerve?

Explanation

When the stereociliair are moved by endolymph they will send faster action potential, otherwise there is always action potentials are being sent even when there is no endolymph movement.

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96. Within the cochlea the entire lining of the derivatives is made up of

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97. What envelopes all the oscicles and has a connection to the pharynx via the future eustachian tube?

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98. The conduction of information in the ear goes through which fluid?

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99. The bulging area below the semicircular canal is the

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100. What are the two cell types of the cristae and maculae? Check all that apply.

Explanation

The supporting cell has microvilli.

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101. As the otic vesicle is occuring where is the ear migrating to?

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102. The membranous labyrinth is inside the

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103. The stereociliar are linked together and attach to a ______ channel which depolarizes the cell when a group of stereociliar pull on it.

Explanation

There is constant depol and hyperpol that occurs at differnt ends of the structures in the ear.

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Where do the middle and external ear develop from?
Most of the fibers in cranial nerve 8 are
How many semicircular canals are there?
The rest of the ear is filled with
The bony labyrith and the membranous labyninth are parts of the
The vestibule, semicircular canals and    ----------...
In which structure is the organ of corti?
A tuft of motile cillia and 1 immotile cillium called a kinocillium is...
The cochlea ductt (scala media)  is in the middle of the scala...
What are the two types of hair cells in the organ of corti: Check all...
The space between the product of the otic vesicle and the bony wall is...
What fluid is between the membranous labyrinth and the bony labyrinth....
The hearing receptors are found in which structure?
The tubular protion spirals around to form the
The saccule and utricle are part of the
Which hair cell type is this? Flask shaped, surrounded by a cup shaped...
What is the inner ear structure for hearing
The membranous labyrynth is fillled with
Dendrites of which cranial nerve are found in the macula of the...
What is the layer of gelatinous glycoprotein that lines the cristae...
Which of the hair cells in the organ of corti are responsible for...
What is the name of the structure  that the inner ear...
Part of the otic vesicle is absorbed by the_______ during the 5th...
The spiral ligament and bony canal are of __________ origin
The malleus and the incus are from the
The external auditory canal forms from the
What is the function of the cristae ampullaris?
How many types of hair cells are there?
The cocchlea duct is also known as the
What transmits proprioceptive information to the brain via the...
The internal ear is derived from the
What are the two portions of cranial nerve 8?
What surrounds the whole structure of the ear that eventually becomes...
The neurons that are found in the modiolus are also known as
The macule of the utrice and saccule both consist of neuroepithelial...
The receptors on the hair cells are mechanoreceptors. Sound waves are...
The external ear comes from branchial arches 1 and 2.  1 gives...
The structure between the stapes and the opening into the otic capsule...
The ventral protion of the tube known as the saccula develops a...
The tympanic cavity is _______ filled
The transduction mechanism in the ear starts with the gelatinous...
What membrane sits on top of the hair cells in the organ of corti?
When the hair cells in the organ of corti are pushed towards the...
All the derivatives of the otic vesicle are filled with
What bone sits on the tympanic membrane?
The cocchlea associates with the ______
The cochlear consists of a central pillar called a  _______...
Endolymph is rich in
The sensory epithelium of the macula in the utricle is lined with
What is the membrane that divides the scala tympani from the scala...
What are the structures that produce endolymph and are found in the...
The eustachian tube is formed from the
Is transmission of auditory information to the brain via the cochlear...
The middle ear cavity is continuous with the
The efferent pathway of the ear is there as a
The perilymph drains out of the bonylabyrith chamber into which space?
Do the three parts of the ear develop together or separately?
The membranous labyrinth is suspended in
The scala vestibuli and scala tympani are continuous with each other...
Do the hair cells in the organ of corti have kinocillium?
High frequency sound will be integrated at the ____ of the cocchlea...
The adsorption focus take on the shape of the
How many communications exist between the inner ear and outer ear?
The membranous labyrinth is from the
Are the cells for auditory and balance senses similar?
What is the hardest bone inside the skull?
What is the thin attachement between the cocchlea duct and the...
Deflection away from the kinocillium or longer stereocillia hair cell...
The auditory receptor or hair cell in the spiral organ of corti sits...
The second pharyngeal arch has cranial nerve _____ . The stapes...
At the end of the external ear canal there is a plug of ______ during...
The cavity between the inner ear and middle ear is the
Fluid in this part of the cochlea is deflected after the stapes pushes...
Where do the external auditory meatus and canal come from?
The middle ear is derived from the
_____ surround inner ear structures
Stratified squamous epithelium lines the outisde of this structure.
The nerve to the inner ear develps from the neural crest cells: true...
The inner ear starts to develop at day
The second arch cartillage is going to give rise to the
The spiral ligament that starts at the end of the...
The cristae ampularis is found in the base of the
Neurons in the ear developed from the ectoderm, they are located...
The ______ transmits information about the position of the head in...
The lining on the inside of the cochlea and vestibular system is...
During which week does the otic vesicle separate into the...
The eustachian tube was the
What layer does the ear develop from?
The typmanic membrane is from: Check all that apply.
What is the fluid that is initially displaced by the stapes &...
The endolymph sac sits in the 
The tympanic membrane has an outer layer of statified squamous...
Outside of the sensory regions the membranous labyrinth is simple...
Maculae are found in
When the stereociliar are resting is there an action potential on the...
Within the cochlea the entire lining of the derivatives is made up of
What envelopes all the oscicles and has a connection to the pharynx...
The conduction of information in the ear goes through which fluid?
The bulging area below the semicircular canal is the
What are the two cell types of the cristae and maculae? Check all that...
As the otic vesicle is occuring where is the ear migrating to?
The membranous labyrinth is inside the
The stereociliar are linked together and attach to a ______ channel...
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