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HISTO-LOGY MODELS
ENDOLYMPH, PERILYMPH
OR NONE STRUCTURE EAR FUNCTIONS
external ear
1 auricle/ pinna funnels sound into external auditory canal
2 external auditory canal canal that leads to and protects tympanic membrane
3 tympanic membrane vibrates in response to sound waves
middle ear
tympanic membrane transmits vibrations to inner ossicles
5 malleus transmits sound vibrations from eardrum to incus
6 incus transmits sound vibrations from malleus to stapes
8 stapes transmits sound vibrations from incus to oval window
9 auditory or Eustachian tube drains mucus from middle ear
10 tensor tympani muscle controls tension of tympanic membrane
inner ear
11 oval window (loc under stapes) transmits sounds vibrations into cochlea
12 round window (loc under accessory eardrum) absorbs pressure wave
13 P & E cochlea contains receptors associated with hearing
14 14 E cochlear duct receptors within provide sense of hearing
15 15 P tympanic duct moves pressure wave away from Organ of Corti
16 16 P vestibular duct takes pressure wave to Organ of Corti
17 17 vestibular membrane separates cochlear duct & vestibular duct
18 18 tectorial membrane causes cilia on hair cells to bend
19 19 basilar membrane moves hair cells of the Organ of Corti
20 20 hair cells receptors for hearing, balance & equilibrium
21 21 E Organ of Corti receptor organ for hearing
22 22 spiral ganglion sends impulses to brain for hearing
23 vestibulocochlear nerve [CN VIII] innervates the ear
24 cochlear branch of CN VIII innervates receptors for cochlea
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25 vestibular branch of CN VIII innervates receptors for balance & motion
26 vestibular ganglion contains the cell bodies of neurons that monitor hair cells
27 P vestibule contain receptors associated with static equilibrium
28 E saccule detects up and down movement
29 E utricle detects forward and backward movement & tilting of head
30 P semicircular canal dynamic equilibrium
31 E semicircular duct contain receptors associated with dynamic equilibrium
32 32 P & E Ampulla enlarged part of semicircular canal that contains hair cells and cristae
E maculae
receptor associated with static equilibrium, found in saccule and utricle
34 E cristae receptor associated with dynamic equilibrium, found in ampulla
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BONUS?: TEMPORAL BONE
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