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NS Exam 1 > Ear Anatomy > Flashcards

Ear Anatomy Flashcards

1
Q

What provides the blood supply to the external ear?

A

Posterior auricular A.

Superficial temporal A.

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2
Q

What innervates the external surface of the Tympanic membrane?

A

Auricular branch of Vagus N.

Auriculotemporal N. (CN V3)

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3
Q

What innervates the internal surface of the tympanic membrane?

A

Glossopharyngeal N. (CN IX)

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4
Q

What is the innervation of the external ear?

A

Great Auricular (C2/C3) - Most of cranial surface)

Auriculotemporal N. (V3) - Tragus and anterior wall of external acoustic meatus

Vagus N (Auricular branch) - External acoustic meatus

Facial N - small areas within the concha

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5
Q

Between what layers in the ear does an Auricular hematoma collect?

A

Perichondrium and cartilage

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6
Q

A patient presents with otitis externa. Where is their infection located?

A

External Acoustic Meatus

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7
Q

What is the physical composition of the External Acoustic meatus?

A

Lateral 1/3 - cartilage

Medial 2/3 - bone

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8
Q

When visualizing the tympanic membrane, where is the cone of light located?

A

Anterior/Inferior

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9
Q

What bone of the middle ear is embedded in the tympanic membrane?

A

Malleus (handle and umbo)

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10
Q

In otitis media, why does the tympanic membrane appear red and bulging?

A

Inflammation and swelling in the middle ear can block the pharyngotympanic tube => Fluid buildup in middle ear => Bulging

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11
Q

What kind of deafness results from a ruptured tympanic membrane?

A

Conduction deafness

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12
Q

When would a myringotomy procedure be performed? What are the steps?

A

Otitis media

  1. Incision of ear drum
  2. Aspiration of fluid
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13
Q

What is a tympanostomy?

A

Ear tube placement

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14
Q

What does the Tegmen Tympani keep the middle ear separate from?

A

Brain/middle cranial fossa

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15
Q

What does the jugular wall keep the tympanic cavity separate from?

A

Bulb of Internal jugular V.

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16
Q

What does the Labrinthine wall keep the tympanic cavity separate from?

A

Inner Ear

17
Q

What middle ear bone pushes on the oval window?

A

Stapes

18
Q

What does the mastoid wall keep the tympanic cavity separate from?

A

Mastoid air cells

Facial canal

19
Q

What does the anterior wall keep the tympanic cavity separate from?

A

Internal Carotid A.

20
Q

What wall of the tympanic cavity are the opening for pharyngotympanic tube and canal for tensor tympani located?

A

Anterior wall

21
Q

What wall are the oval window, round window, and promontory located on in the tympanic cavity?

A

Medial (Labrinthine) wall

22
Q

What does the tensor tympani M. insert onto in the middle ear?

A

Malleus (handle)

23
Q

What part of the stapes does the stapedius M. insert onto?

A

Neck

24
Q

What muscles of the ear prevent damage from loud sounds?

A

Tensor Tympani M.

Stapedius M.

25
Q

What innervates Tensor Tympani M.?

A

CN V3

26
Q

What innervates Stapedius M.?

A

CN VII

27
Q

What part of the inner ear is located within the petrous part of the temporal bone?

A

Bony Labyrinth

28
Q

The semicircular canals of the inner ear are filled with what fluid?

A

Perilymph

29
Q

The membranous labyrinth of the inner ear is filled with what fluid?

A

Endolymph

30
Q

What part of the membranous labyrinth senses gravity?

A

Utricle and saccule

31
Q

What part of the membranous labyrinth senses acceleration?

A

Semicircular ducts

32
Q

What part of the membranous labyrinth senses hearing?

A

Cochlear labyrinth/duct

33
Q

What artery supplies the inner ear?

A

Internal/Labyrinthine A.

34
Q

What part of the Membranous Labyrinth contains Cochlear N.?

A

Basilar Membrane

35
Q

What membrane are the hair cells of the cochlea embedded in?

A

Tectorial Membrane

NS Exam 1 (18 decks)

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