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Anatomy Unit 3 > Ear and oral cavity > Flashcards

Ear and oral cavity Flashcards

1
Q

what is the somatic sensation of the external ear?

A

variations CN 5, 7, 9, 10
lesser occipital nerve: C2 ventral ramus
great auricular nerve: C2, C3

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2
Q

what are the ossicles lateral to medial?

A

malleus, incus, stapes

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3
Q

what interacts with the tympanic membrane?

A

handle of the malleus

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4
Q

what goes through the handle of the malleus?

A

chorda tympani

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5
Q

where does the lesser petrosal nerve form a synapse with the otic ganglion for the parotid gland?

A

medial wall, promontory with tympanic plexus

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6
Q

where does the glossopharyngeal nerve originate?

A

lateral medulla oblongata and through the jugular foramen

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7
Q

what does the tympanic nerve innervate?

A

the middle ear mucosal surface

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8
Q

what gives off the lesser petrosal nerve?

A

tympanic nerve

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9
Q

what does the stylopharyngeal nerve innervate

A

the stylopharyngeal muscle
branchial/ somatic motor

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10
Q

what does the carotid sinus regulate?

A

blood pressure (visceral sensory)

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11
Q

what does the carotid body regulate?

A

SaO2, chemical sensation

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12
Q

what are the functions of the lingual branch of CN 9?

A

chemical sensation: taste of posterior 1/3 of tongue
somatic sensation: posterior 1/3 tongue and pharynx

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13
Q

what are the branches of CN 9?

A

tympanic nerve, stylopharyngeal nerve, carotid branch, lingual branch, communicating branches to the vagus nerve

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14
Q

what is the innervation and function of the tensor tympani?

A

function: tenses tympanic membrane, decrease the vibration to dampen chewing **coordinated with mastication muscles
innervation: tensor tympani nerve from CN V3

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15
Q

what is the function and innervation of the stapedius?

A

function: dampens vibrations passed to cochlea via the oval window
innervation: nerve to stapedius from CN 7

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16
Q

what is hyperacusis?

A

a disorder in loudness perception

17
Q

what is the cochlear compartment of the inner ear?

A

hearing, through cochlear division of CN 8
organ of corti

18
Q

what is the vestibular compartment of the inner ear?

A

proprioception and balance through vestibular division of CN 8

19
Q

what is the blood supply for the inner ear?

A

branches from the AICA- labyrinthine a. and common cochlear a.

20
Q

what are the framing structures of the hard palate?

A

maxilla: superior alveolar process
palatine bone: horizontal plate

21
Q

what is the innervation of the oral cavity?

A

maxillary nerve (CN V2)- superior alveolar nerve (posterior, middle, anterior)
mandibular nerve (CN V3): inferior alveolar nerve, buccal n. lingual n.

22
Q

what are the muscles of the soft palate?

A

tensor veli palatini, levator veli palatini, uvula

23
Q

what is the innervation of the tensor veli palatini?

A

CN V3

24
Q

what is the innervation of the levator veli palatini?

A

CN 10

25
Q

what are the superior extrinsic muscles of the tongue?

A

palatoglossus, styloglossus

26
Q

what is the function and innervation of the palatoglossus?

A

function: elevate posterior tongue (swallow) or depress soft palate (breath)
innervation CN 10

27
Q

what is the function and innervation of the styloglossus?

A

function: retract tongue, forms a central trough w/ genioglossus for swallowing
innervation: CN 10

28
Q

what are the inferior extrinsic muscles?

A

hypoglossus, genioglossus

29
Q

what is the function and innervation to the hypoglossus?

A

function: depress and retract tongue
innervation: CN 12

30
Q

what is the function and innervation to the genioglossus?

A

function: depress and protrude tongue, side bend tongue
innervation: CN 12

31
Q

what happens if there is a CN 12 deficiency?

A

imbalance of bilateral intrinsic and extrinsic muscles
protrusion of the tongue- deviated to the WEAKER side
difficult to eat and speak, bite tongue easily

32
Q

what is the somatic sensation to the tongue?

A

anterior 2/3 tongue: special sensation- taste CN 7 (chorda tympani) and CN V3 for spicy and pungency (lingual n.)
posterior 1/3 tongue: special and somatic from CN 9
epiglottis and central part of posterior 1/3: special and somatic sensation from CN 10

33
Q

what is the visceral innervation to the parotid gland?

A

CN 9, lesser petrosal nerve, otic ganglion

34
Q

what is the visceral innervation to the submandibular and sublingual gland?

A

CN 7, chorda tympani, lingual n.

Anatomy Unit 3 (7 decks)

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