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Micro Anatomy Ear
ears
16
Histology
Professional
02/02/2012

Additional Histology Flashcards

 


 

Cards

Term
external ear canal
Definition

external auditory meatus

from pinna/auricle to tympanic membrane

elastic cartilage wall

lined by sparsely haired skin

 sebaceous and apocrine (ceruminous) glands

Term
ear wax
Definition
sebum plus cerumen
Term
tympanic membrane
Definition

separates external ear canal from middle ear

outer cuticular epithelial layer

middle fibrous layer

inner mucus (epithelial) layer - connects w middle ear epithelium

 

Term
middle ear
Definition

within petrous temporal bone

lined by simple squamous to cuboidal epithelium

near eustachian tubes: columnar with cilia

Term
3 bones of petrous temporal bone
Definition

malleus

incus

stapes

Term
eustachian tube
Definition

branches off the tympanic bulla and extends to nasopharynx

 

Term
function of middle ear
Definition

tympanic membrane movement causes bones of inner ear t move, amplifies sound waves and transmits to inner ear

 

Term
inner ear
Definition

blind ended structure that begins at oval window (in contact w stapes)

membranous labyrinth

endolymph in membranes, perilymph bw membrane and bone

Term
round window
Definition

smaller emergency exit in inner ear

oval window is entrance

Term
vestibule
Definition

utricle and saccule

contain maculae sensory

Term
maculae
Definition

sensory hairs in gel material with otoliths

send signals to brain about head movement

Term
semi circular canals
Definition

3 of them

filled with endolymph

ampulla at ends connect to utricle

crista ampularis of ampulla similar function to maculae

Term
cochlea
Definition
conical, spiral shaped space in the petrous temporal bone
Term
osseous labyrinth
Definition

bone surrounding semi circular canals

space inside: scala media

dorsal: vestibular membrane

ventral: basilar membrane

Term
organ of corti
Definition

where hearing happens

on the basilar membrane

auditory receptor cells

nerve fibers to spiral ganglion to brain

Term
travel of sound through ear
Definition

sound waves

external ear canal

tympanic membrane

middle ear bones

oval window

perilymph in osseous labyrinth

vestibular membrane

endolymph of scala media

basilar membrane

Organ of Corti

spiral ganglion

brain

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