special senses: ear Flashcards
parts
external ear middle ear inner ear cochlea receptors in inner ear
external ear
conducts sound
external ear parts
auricle (pinna) external auditory (acoustic) canal (meatus) tympanic membrane (eardrum)
auricle (pinna)
elastic cartilage, covered with skin
middle ear
conducts sound
middle ear parts
Eustachian tube
ear ossicles
eustachian tube
also called pharyngotympanic tube
ear ossicles
malleus
incus
stapes
malleus
secured to tympanic membrane
stapes
transmits sound to inner ear by oval window
inner ear
aka labyrinth
-detects sound, involved with equilibrium
inner ear (labyrinth) parts:
bony labyrinth
membranous labyrinth
bony labyrinth
tunnels in temporal bone
contains perilymph
bony labyrinth parts
semicircular canals (equilibrium)
vestibule (equilibrium)
cochlea (hearing)
membranous labyrinth
surrounded and protected by bony labyrinth
contains endolymph
membranous labyrinth parts
semicircular ducts (inside canals) utricle and saccule (inside vestibule) cochlear duct (inside cochlea)
cochlea
coiled
-each coil has three channels
cochlea channels
- scala vestibuli (upper, perilymph)
- scala tympani (lower, perilymph)
- cochlear duct (middle, endolymph)
cochlea membranes
vestibular membrane
basilar membrane
tectorial membrane
vestibular membrane
-b/w cochlear duct and scala vestibuli
basilar membrane
-b/w cochlear duct and scala tympani
tectorial membrane
covers hair cells (=receptor cells)
receptors in inner ear
- hair cell that synapses with an associated neuron
- send impulses t obrain by crfanial nerve VIII
- hairs =cilia tat extend into endolymph
- tips of cilia embedded in tectorial membrane (stability)
