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Head and neck > Histology Ear > Flashcards

Histology Ear Flashcards

1
Q

Path of sound

A

External canal –> ear drum –> malleolus –> incus –> stapes –> oval window –> cochlea

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2
Q

Semicircular arches function

A

Equilibrium

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3
Q

Round window function

A

Decrease pressure in inner ear as there is liquid in the inferior part of the cochlea which during vibration causes pressure to increase

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4
Q

Which window is connected to stapes

A

Oval window

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5
Q

Which window functions to release pressure of the inner ear

A

Round window

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6
Q

Order of ossicles

A

Malleolus –> incus –> stapes

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7
Q

Function of ossicles

A

Modulate movement of tympanic membrane

Put pressure to oval window by incrementing incoming waves

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8
Q

Where are the organ of corti located

A

Inside the cochlea within the white spaces

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9
Q

Order of vesticular mbm.
basilar mbm.
organ of corti

A

Vestibular mbm
Organ of corti
Basilar mbm

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10
Q

Depolarization of hair cell sterocilia in the cochlea results from the interaction with

A

Tectorial mbm

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11
Q

Location of tectorial mbm

A

Around the hair cells above the basilar mbm

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12
Q

Organ of corti is on top of

A

Basilar mbm

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13
Q

Sensory epithelium formed of

A

Hair cells on top of basilar mbm

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14
Q

Function of spiral ganglion

A

Fire action potential

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15
Q

Cochlear duct hold which liquid

A

Endolymph

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16
Q

What produces endolymph of cochlear duct

A

Stria vascularis

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17
Q

Contents of scala vestibuli

A 
Vestibular ligament
Spiral ganglion 
Vestibular membrane
Tectorial membrane 
Organ of corti
Basilar membrane 
Stria vascularis
18
Q

Location of supporting cells

A

Between hair cells

19
Q

What separates the middle from inner ear

A

Oval window

20
Q

Bony labyrinth formed of

A

Semicircular canals, cochlea, vestibule

21
Q

Membranous labyrinth formed of

A

Saccule, utricle and cochlear duct

22
Q

What structure connected to the semicircular duct

A

Utricle

23
Q

Which structure connected to the cochlear duct

A

Saccule

24
Q

Relationship between bony and membranous labyrinth

A

Membranous labyrithn held within the bony labyrinth

25
Q

Liquid inside membranous labyrinth

A

Endolymph produced by stria vascularis

26
Q

Enlargements of vestibular canals

A

Ampullae

27
Q

How do the semicircular canals move

A

Movement of endolymph (stria vascularis) will move the cupula

28
Q

Endolymphatic sac formed of

A

Union of saccule with utricle

29
Q

Parts of inner ear histology image

A 
Saccule
Macula of saccule 
Utricle 
Macula of utricle 
Crysta ampullaries of semicircular canal
30
Q

Cells of the macula

A

Type 1 and Type 2 neuroepithelial hair cells

31
Q

Macula covered in

A

Gelatinous layers called otolithic mbm

32
Q

Where are crystals located

A

In the hair cells of macula

33
Q

Macula covered in what mbm

A

Otolithic mbm which contrains crystals

34
Q

Substance of otolithic mbm

A

Glycoproteins with calcified structures called crystals/otoconia

35
Q

Histology of crysta ampullaries

A

Filled with endolymph
Thicker than maculae
Do not contain otoconia (crystals)

36
Q

Endolymphatic sac function

A

Reabsorption of endolymph

37
Q

Circular movement of head disrupts

A

Endolymph in semicircular canals

38
Q

Linear movement of head disrupts

A

Saccule and utricle

39
Q

Linear disruption steps

A

Disruption of otolith (crystals) in saccule and utricle
Transmitted to maculae through gelatinous layer
Sterocilia are bent causing an electrical signal

40
Q

Periplymph found in

A

Between the bony and membranous labyrinth

41
Q

Endolymph found in

A

Within the membranous labyrinth

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