Histology Ear Flashcards
Path of sound
External canal –> ear drum –> malleolus –> incus –> stapes –> oval window –> cochlea
Semicircular arches function
Equilibrium
Round window function
Decrease pressure in inner ear as there is liquid in the inferior part of the cochlea which during vibration causes pressure to increase
Which window is connected to stapes
Oval window
Which window functions to release pressure of the inner ear
Round window
Order of ossicles
Malleolus –> incus –> stapes
Function of ossicles
Modulate movement of tympanic membrane
Put pressure to oval window by incrementing incoming waves
Where are the organ of corti located
Inside the cochlea within the white spaces
Order of vesticular mbm.
basilar mbm.
organ of corti
Vestibular mbm
Organ of corti
Basilar mbm
Depolarization of hair cell sterocilia in the cochlea results from the interaction with
Tectorial mbm
Location of tectorial mbm
Around the hair cells above the basilar mbm
Organ of corti is on top of
Basilar mbm
Sensory epithelium formed of
Hair cells on top of basilar mbm
Function of spiral ganglion
Fire action potential
Cochlear duct hold which liquid
Endolymph
What produces endolymph of cochlear duct
Stria vascularis
Contents of scala vestibuli
Vestibular ligament Spiral ganglion Vestibular membrane Tectorial membrane Organ of corti Basilar membrane Stria vascularis
Location of supporting cells
Between hair cells
What separates the middle from inner ear
Oval window
Bony labyrinth formed of
Semicircular canals, cochlea, vestibule
Membranous labyrinth formed of
Saccule, utricle and cochlear duct
What structure connected to the semicircular duct
Utricle
Which structure connected to the cochlear duct
Saccule
Relationship between bony and membranous labyrinth
Membranous labyrithn held within the bony labyrinth
Liquid inside membranous labyrinth
Endolymph produced by stria vascularis
Enlargements of vestibular canals
Ampullae
How do the semicircular canals move
Movement of endolymph (stria vascularis) will move the cupula
Endolymphatic sac formed of
Union of saccule with utricle
Parts of inner ear histology image
Saccule Macula of saccule Utricle Macula of utricle Crysta ampullaries of semicircular canal
Cells of the macula
Type 1 and Type 2 neuroepithelial hair cells
Macula covered in
Gelatinous layers called otolithic mbm
Where are crystals located
In the hair cells of macula
Macula covered in what mbm
Otolithic mbm which contrains crystals
Substance of otolithic mbm
Glycoproteins with calcified structures called crystals/otoconia
Histology of crysta ampullaries
Filled with endolymph
Thicker than maculae
Do not contain otoconia (crystals)
Endolymphatic sac function
Reabsorption of endolymph
Circular movement of head disrupts
Endolymph in semicircular canals
Linear movement of head disrupts
Saccule and utricle
Linear disruption steps
Disruption of otolith (crystals) in saccule and utricle
Transmitted to maculae through gelatinous layer
Sterocilia are bent causing an electrical signal
Periplymph found in
Between the bony and membranous labyrinth
Endolymph found in
Within the membranous labyrinth
