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DDS1-gross anatomy > ear > Flashcards

ear Flashcards

1
Q

where are the organs for hearing and balance found

A

internal ear

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2
Q

organ for hearing

A

cochlea

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3
Q

organ for balance

A

semicircular canals

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4
Q

concha is made up of

A

cymba (upper) and cavity (lower)

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5
Q

EAM is a canal that leads from

A

auricle to tympanic membrane

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6
Q

what separates the EAM from middle ear

A

tympanic membrane

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7
Q

what bone attaches to the tympanic membrane

A

malleus

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8
Q

middle ear is in what part of the skull

A

petrous part of temporal bone

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9
Q

two parts of the middle ear

A
  • tympanic cavity

- epitympanic recess

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10
Q

middle ear communicates with what posteriorly

A

mastoid area

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11
Q

middle ear communicates with what anteriorly

A

nasopharynx

*PT tube connects middle ear to nasopharynx

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12
Q

roof of middle ear

A
  • epitympanic recess
  • “tegmental wall”
  • separates it from MCF
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13
Q

floor of middle ear

A
  • “jugular wall”
  • separates it from IJV
  • has an opening for the tympanic n
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14
Q

tympanic n is a branch of what CN

A

glossopharyngeal (CN9)

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15
Q

lateral wall of middle ear

A
  • tympanic membrane
  • “membranous wall”
  • chorda tympani (CN7-facial) crosses here
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16
Q

medial wall of middle ear

A
  • “labyrinthine wall”

- has a prominence for facial n

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17
Q

tympanic plexus of nerves is found where

A

on the promotory of the medial wall

18
Q

tympanic plexus

A
  • begins with tympanic branch (CN9)
  • also has a branch from internal carotid plexus
  • lesser petrosal n leaves it
19
Q

tympanic plexus of nn supplies

A
  • mucosa of middle ear
  • mastoid area
  • PT tube
20
Q

where does chorda tympani n enter the middle ear

A

posterior (mastoid) wall

21
Q

chorda tympani n exits the middle ear via

A

anterior (carotid) wall

22
Q

what does the anterior wall separate middle ear from

A
  • PT tube

- internal carotid a and plexus

23
Q

what m enters ear through anterior wall

A

tensor tympani m (above PT tube)

24
Q

what “feeds” into the tympani plexus of nn

A
  • tympani n (CN9) from floor

- branch from internal carotid plexus from anterior

25
Q

what exits the tympani plexus

A

lesser petrosal n (leaves anterior wall)

26
Q

PT tube connects

A

middle ear to nasopharynx

27
Q

what connects the tympanic membrane to the oval window

A

ossicles

28
Q

name the three ossicle bones

A

incus, malleus, stapes

29
Q

which bone is attached to the tympanic membrane

A

malleus

30
Q

what attached to the oval window on medial wall

A

stapes

31
Q

tensor tympani m

A
  • origin: PT tube, greater wing of sphenoid, petrous part of temporal bone
  • insertion: malleus
  • action: pulls malleus medially; tenses tympanic membrane; reduces force of vibrations
  • nerve: n to medial pterygoid m (CNV3)
32
Q

stapedius m

A
  • origin: pyramidal eminence
  • insertion: neck of stapes
  • action: contract in response to loud noise; prevent excessive oscillations
  • n to the stapedius m (facial n)
33
Q

internal ear

A
  • petrous part of temporal bone
  • bony: cochlea; vestibule; semicircular canals
  • membranous: utricle and saccule; ducts
34
Q

organs of balance

A

semicircular duct, utricle, and saccule

35
Q

organ of hearing

A

cochlear duct

-contains scala vestibuli (waves to apex) and scala tympani (waves to base)

36
Q

receptor of auditory stimuli

A

spiral organ (organ of Corti)

37
Q

special afferent fibers to the internal ear

A

vestibulocochlear n (CN8)

38
Q

cochlear n

A

hearing

39
Q

vestibular n

A

balance

40
Q

nerve supply to spiral organ and cochlear duct

A

cochlear n (CN8)

41
Q

nerve supply to semicircular ducts, utricle, and saccule

A

vestibular n (CN8)

DDS1-gross anatomy (39 decks)

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