Lecture 31b Flashcards

1
Q

2 parts of external ear

A

auricle (pinna) and external acoustic meatus

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2
Q

parts of auricle

A

helix, antihelix, concha, tragus, antitragus, lobule

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3
Q

outer portion of the external acoustic meatus is cartilaginous and secretes a waxy material called

A

cerumen

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4
Q

the middle ear consists of 3 bones called

A

ossicles

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5
Q

roof of the middle ear

A

tegmen tympani

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6
Q

the space directly internal to the tympanic membrane is called the

A

tympanic cavity

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7
Q

space directly above tympanic membrane is called the

A

epitympanic recess

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8
Q

eardrum

A

tympanic membrane

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9
Q

when center of tympanic membrane becomes indrawn, it creates the

A

umbo (point)

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10
Q

medial wall of middle ear is formed by

A

promontory, created by the base of the cochlea

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11
Q

2 openings associated with the promontory

A

fenestra vestibuli and fenestra cochlea

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12
Q

oval window, receives footplate of the most medial of the 3 ossicles (the stapes)

A

fenestra vestibuli

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13
Q

round window, closed by a membrane

A

fenestra cochlea

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14
Q

opening to mastoid antrum

A

aditus ad antrum

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15
Q

projection that originates at the stapedius

A

pyramidal eminence

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16
Q

the auditory ossicles

A

malleus (most lateral), uncus (intermediate), and stapes (most medial)

17
Q

organs of internal ear

A

cochlear duct (hearing), semicircular ducts, utricle and saccule (balance and position)

18
Q

fluid of the membranous labyrinth

A

endolymph

19
Q

3 parts of body labyrinth

A

cochlea (contains cochlear duct), vestibule (contains utricle and saccule), semicircle canals (contain semicircular ducts)

20
Q

space between bony and membranous labyrinth contains a fluid called

A

perilymph

21
Q

center of the cochlea is called the

A

cupula

22
Q

inside the cochlea, there is a bony shelf called the

A

osseous spinal lamina

23
Q

middle portion of the bony labyrinth

A

vestibule

24
Q

point where semicircular canals join the vestibule

A

ampulla

25
Q

has neural sensory endings which convert the mechanical energy of vibrating fluid to electrical energy

A

membranous labyrinth

26
Q

cochlear duct is modified in the

A

vestibular (Reissner’s) membrane and basilar membrane

27
Q

basilar membrane is further modified into the

A

spiral organ of Corti

28
Q

stimulation of fibers from the __ allows turning the head, endolymph flow over sensory endings (allows kinetic equilibrium)

A

ampullary crest

29
Q

hearing summary

A

tympanic membrane vibrates ossicles, stapes vibrates perilymph, which conveys vibrations to endolymph, stimulation of auditory endings that project to CN 8