Histology Ear

Question 1

Path of sound

Answer 1

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

Question 2

Semicircular arches function

Answer 2

Equilibrium

Question 3

Round window function

Answer 3

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

Question 4

Which window is connected to stapes

Answer 4

Oval window

Question 5

Which window functions to release pressure of the inner ear

Answer 5

Round window

Question 6

Order of ossicles

Answer 6

Malleolus –> incus –> stapes

Question 7

Function of ossicles

Answer 7

Modulate movement of tympanic membrane

Put pressure to oval window by incrementing incoming waves

Question 8

Where are the organ of corti located

Answer 8

Inside the cochlea within the white spaces

Question 9

Order of vesticular mbm.
basilar mbm.
organ of corti

Answer 9

Vestibular mbm
Organ of corti
Basilar mbm

Question 10

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

Answer 10

Tectorial mbm

Question 11

Location of tectorial mbm

Answer 11

Around the hair cells above the basilar mbm

Question 12

Organ of corti is on top of

Answer 12

Basilar mbm

Question 13

Sensory epithelium formed of

Answer 13

Hair cells on top of basilar mbm

Question 14

Function of spiral ganglion

Answer 14

Fire action potential

Question 15

Cochlear duct hold which liquid

Answer 15

Endolymph

Question 16

What produces endolymph of cochlear duct

Answer 16

Stria vascularis

Question 17

Contents of scala vestibuli

Answer 17

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

Question 18

Location of supporting cells

Answer 18

Between hair cells

Question 19

What separates the middle from inner ear

Answer 19

Oval window

Question 20

Bony labyrinth formed of

Answer 20

Semicircular canals, cochlea, vestibule

Question 21

Membranous labyrinth formed of

Answer 21

Saccule, utricle and cochlear duct

Question 22

What structure connected to the semicircular duct

Answer 22

Utricle

Question 23

Which structure connected to the cochlear duct

Answer 23

Saccule

Question 24

Relationship between bony and membranous labyrinth

Answer 24

Membranous labyrithn held within the bony labyrinth

Question 25

Liquid inside membranous labyrinth

Answer 25

Endolymph produced by stria vascularis

Question 26

Enlargements of vestibular canals

Answer 26

Ampullae

Question 27

How do the semicircular canals move

Answer 27

Movement of endolymph (stria vascularis) will move the cupula

Question 28

Endolymphatic sac formed of

Answer 28

Union of saccule with utricle

Question 29

Parts of inner ear histology image

Answer 29

``` Saccule Macula of saccule Utricle Macula of utricle Crysta ampullaries of semicircular canal ```

Question 30

Cells of the macula

Answer 30

Type 1 and Type 2 neuroepithelial hair cells

Question 31

Macula covered in

Answer 31

Gelatinous layers called otolithic mbm

Question 32

Where are crystals located

Answer 32

In the hair cells of macula

Question 33

Macula covered in what mbm

Answer 33

Otolithic mbm which contrains crystals

Question 34

Substance of otolithic mbm

Answer 34

Glycoproteins with calcified structures called crystals/otoconia

Question 35

Histology of crysta ampullaries

Answer 35

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

Question 36

Endolymphatic sac function

Answer 36

Reabsorption of endolymph

Question 37

Circular movement of head disrupts

Answer 37

Endolymph in semicircular canals

Question 38

Linear movement of head disrupts

Answer 38

Saccule and utricle

Question 39

Linear disruption steps

Answer 39

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

Question 40

Periplymph found in

Answer 40

Between the bony and membranous labyrinth

Question 41

Endolymph found in

Answer 41

Within the membranous labyrinth