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Auditory A&P > Inner Ear > Flashcards

Inner Ear Flashcards

1
Q

Three parts of inner ear

A

Vestibular division, auditory division, bony labyrinth in petrous portion

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2
Q

Promontory

A

Bony, protect oval and round window

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3
Q

Ampullae

A

Contain sensory receptor organs of SC

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4
Q

Responsive to linear acceleration

A

Utricle and Saccule

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5
Q

Cochlear turns

A

2 and 3/4 turns

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6
Q

Central bony canal of cochlea

A

Modiolus

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7
Q

Diameter of cochlea

A

9 mm

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8
Q

Cochlear height

A

5 mm high

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9
Q

Organization of Cochlea (top to bottom)

A

Scala vestibuli, Reissner’s membrane, Scala media (cochlear duct), Scala Tympani

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10
Q

Spiral Lamina

A

Composed of two plates, osseous

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11
Q

Lower shelf of spiral lamina

A

Supports connection with Basilar membrane

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12
Q

Upper shelf of spiral lamina

A

Continuos with the spiral limbus, serves as an attachment for tectorial membrane

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13
Q

Reissner’s membrane

A

Two layers of epithelial cells

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14
Q

Organ of Corti lies…

A

Lies on top of Basilar membraine

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15
Q

Connective tissues consist of…

A

Intracellular material, collagenous fibers

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16
Q

Basilar membrane consists of …

A

Collagen type II, IV, XI

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17
Q

Portions of Basilar membrane

A

Outer spiral ligament, inner spiral ligament, pectinate and arcuate zone

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18
Q

Arcuate zone

A

vibrates little

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19
Q

Pectinate zone

A

Free to vibrate upon sound induced displacement

20
Q

Basilar membraine length

A

35 mm

21
Q

BM Thickest at ____

A

Apex

22
Q

Cochlear duct width at base and apex

A

Broad near base and narrow towards apex

23
Q

Stiffness ratio of BM

A

100:1 from base to apex

24
Q

Hensen’s stripe

A

Underside of Tectorial Membrane, above IHCs

25
Q

IHC function and shape

A

Transforming of sound, does not vibrate flask-shaped

26
Q

OHC function and shape

A

increase sensitivity of IHCs, tube shaped

27
Q

Populations of hair cells

A

3,500 IHCs and 13500 OHCs

28
Q

OHC arrangement

A

3 rows basal turn, 4 rows middle turn, 5 rows apically

29
Q

Stereocilia arrangement on each OHC

A

W or V shaped

30
Q

Stereocilia arrangment on each IHC

A

flat shapped, shallow U

31
Q

How many rows of cilia?

A

2-3 rows on each cell

32
Q

Positioning of IHCs of BM

A

Arcuate zone

33
Q

Difference between diameter and length of OHC

A

Diameter remains constant, length varies

34
Q

Length of OHCs, Diameter?

A

25 μm basally, 70 μm apically, 7μm

35
Q

Number of stereocilia per OHC

A

130 in basal, 70 in apical

36
Q

Cell body height of IHC

A

fairly constant

37
Q

Number of stereocilia per IHC

A

50-70

38
Q

Outer hair cell links?

A

Tip links and lateral links

39
Q

Deiter’s cells

A

Rest on BM, cradle bottom of OHCs

40
Q

Fingerlike projections of DCs

A

Project to surface of organ of corti to hold top of OHC

41
Q

Reticular Lamina

A

The phalangeal processes, tops of the pillar cells, and cuticular plates of the IHCs and OHC

42
Q

Perilymph

A

Space between bony and membranous labyrinths (SV and ST)

43
Q

Endolymph

A

Membranous labyrinth (Scala Media)

44
Q

Scala media communicates at..

A

Basal Region with saccule at ductus reuniens

45
Q

Endolymphatic sac

A

Regulates endolympth pressure

46
Q

Reissner’s membrane attached to outer wall by…

A

Spiral Ligament

47
Q

Cochlear Aqueduct

A

Runs parallel to Internal Auditory Meatus, allows transfer of Cerebrospinal fluid

Auditory A&P (6 decks)

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