Exam 2: Ear Flashcards

1
Q

Auricle

A

Elastic cartilage

localizes and amplifies sound

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2
Q

External acoustic meatus

A

Lateral 1/3 cartilage, Medial 2/3 temporal bone

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3
Q

Tympanic membrane

A

External surface - thin epidermis
Internal surface - simple squamous to simple cuboidal epithelium (mucous membrane of middle ear cavity)
Collagen and elastic fibers radially and circularly arranged with fibroblasts - repair

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4
Q

Middle ear function

A

convert sound waves into mechanical vibrations

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5
Q

Middle ear is lined with

A

simple squamous epithelium

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6
Q

Loss of function of middle ear causes

A

conductive hearing loss

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7
Q

Stapes

A

bone attached to oval window

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8
Q

Attenuation reflex

A

with tensor tympani protects internal ear from damaging loud sounds

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9
Q

Otosclerosis

A

bone remodeling causing Stapes to be fixed onto oval window

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10
Q

Auditory tube

A

connects middle ear to nasopharynx
Lined with pseudostratified columnar epithelium with goblet cells
Equalizes pressure in middle ear

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11
Q

Mastoid air cells

A

located within mastoid process of temporal bone

lined with simple squamous epithelium

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12
Q

Endolymphatic space

A

within membranous labyrinth

Contains endolymph fluid - high in K, low Na

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13
Q

Perilymphatic space

A

between membranous and bony labyrinth

Contains perilymph fluid, high in Na, low K

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14
Q

Cortilymphatic space

A

within tunnels of organ of Corti in chochlea

contain cortilymph high in Na, low in K

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15
Q

Hair cells

A

mechanoelectric transducers

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16
Q

Type I hair cells

A

cup-shaped ending surrounding base of cell

17
Q

Type II hair cells

A

many afferent endings

18
Q

Cristae Ampullaris

A

sensory receptor within ampulla of semicircular ducts
Detects angular movement of head
Cupula - gelatinous protein attached to hair cells of each crista

19
Q

Macula of utricle and saccule

A

Utricle (horizontal plane) and saccule (verticle plane)
Hair cells have sterocilia and one kinocilium
Sense linear movement of head

20
Q

Cochlear duct (Scala media)

A

filled with endolymph
contains organ of Corti
ends at Helicotrema

21
Q

Scala vestibuli

A

above cochlear duct
starts at oval window
filled with perilymph

22
Q

Scala tympani

A

below cochlear duct
ends at round window
filled with perilymph

23
Q

Vestibular (Reissner’s) membrane

A

Separates cochlear duct from Scale vestibuli
Roof of Scala media
Two layers of squamous epithelium - tight junctions

24
Q

Stria vascularis

A

Produces endolymp

in Scala media

25
Basilar membrane
floor of Scala media | supports organ of Corti
26
Organ of Corti
contains inner and outer hair cells - made of sterocilia, no kinocilium
27
Inner and outer phalangeal cells
Contain cortilymph | Hair cells rest on top of phalangeal cells
28
Pillar cells
inner spiral tunnel
29
Tectorial membrane
Collagen type II, V, and IX glycoproteins otogelin and tectorin attaches to hair cells by stereocilia