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Auditory A&P > Anatomy of Ear > Flashcards

Anatomy of Ear Flashcards

1
Q

Four parts of Temporal Bone

A

Squamous, mastoid, tympanic, petrous

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2
Q

Squamous portion

A

Thin, bony plate on lateral wall

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3
Q

Mastoid

A

Fairly thick, has air-filled spaces

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4
Q

Tympanic portion

A

Floor and wall of ear canal

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5
Q

Petrous Portion

A

houses the sensory organs of hearing and balance

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6
Q

VIII Nerve

A

passes through internal auditory meatus

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7
Q

Outer ear

A

Pinna, EAM, and lateral TM

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8
Q

EAM

A

Skeleton medially, Cartilaginous laterally

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9
Q

Measurement of External Auditory Canal

A

Horiz diameter of 6 mm, Vert diam of 9 mm, 23-25 mm in length

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10
Q

Tympanic Membrane thickness and diameter

A

.1 mm thin, vert dia 9-10 mm, horiz 8-9 mm

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11
Q

Inward displacement of TM

A

2 mm, peak called Umbo

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12
Q

Pars Tensa layers

A

Epidermis, connective tissue, radial and circular fibers, connective tissue, mucosa

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13
Q

Pars Flaccida

A

Everything except radial and circular fibers

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14
Q

Umbo

A

Coincides with tip of manubrium of the malleus (1:00 in right ear, 11:00 in left)

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15
Q

Stapedius connects to

A

Stapes

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16
Q

Tensor Tympani connects to

A

manubrium of malleus, pulls medially

17
Q

Attic of middle ear

A

communicates with mastoid air cell system

18
Q

Three ossicles

A

Malleus, incus, and stapes

19
Q

Stapes

A

Smallest bone in human body

20
Q

Malleus

A

9 mm in length, tip of manubrium connects to TM

21
Q

Tympanic Muscle

A

encased in bony canals except for tendon

22
Q

Articular Facet on Malleus

A

Forms joint with af of incus

23
Q

End of long process of incus

A

articulates with head of stapes

24
Q

Stapes attached to oval window by

A

annular ligament

25
Q

Stapedius tendon

A

pulls stapes posteriorly

26
Q

Eustachian Tube

A

Communicates ME with Nasopharynx

27
Q

Portions of ET

A

Bony, isthmus, cartilaginous

28
Q

Cartilaginous Portion of ET

A

Normally closed, opens with swallowing, yawning, sneezing

29
Q

Function of Eustachian tube, Auditory Tube

A

permit ME pressure to equalize with external air, permit drainage of ME secretions

30
Q

Tensor veli palatini muscle

A

Pulls wall of auditory tube laterally during swallowing

31
Q

ET in Adults

A

Rigid, and sloping to drain

32
Q

ET in Children

A

Horizontal and lacks rigidity

Auditory A&P (6 decks)

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