Hearing, Equilibrium Gustation, Olfacotry

Outer Ear

Auricle and External Auditory Canal do what

direct sound waves into ear

Outer Ear

Tympanic Membrane characteristics

thin, translucent

mucous membrane+ skin

Outer Ear

Tympanic Membrane function

recives sound waves and vibrates

vibrations transmitted into the middle ear

Middle Ear (tympanic membrane)

Ossicles

1. mallues (hammer

2. incus (anvil)

3. stapes (stirrup)

Ossicles-

stapedius muscle

tensor tympani muscle

both do that

attached to the stapes

attached to the malleus

Both reflexively contract to lessen the intensity of loud sounds

Middle Ear

Auditory Tube (Eustachian)

connects middle ear to pharynx

allows equalization of pressure

can allow pharyngeal infection to spead to middle ear

Oval Window is attatched to what and goes where

stapes is attached

goes to inner ear

Inner Ear (Labriynth)

3 structures

cochlea

vestibule +semicircular canals (equilibrium)

oval window

Inner ear

sound waves upon entering the inner ear must go where?

to the organ of Corti

Inner Ear (Labriynth)

Oval window

leads into the 1st part of the cochlea- scala vestibuli

Inner Ear (Labriynth)

Scala tympani

continuous w scala vestibuli

Inner Ear (Labriynth)

cochlear duct

b/w the 2 scala chambers in cochlea

contains organ of corti

Inner Ear (Labriynth)

fluid in the scala chambers and cochlear duct

scala vestibuli- perilymph

scala tympani- perlymph

cochlear duct-endolymph

Ear

Organ of Corti characterisitcs

consists of hair cells

tecterial membrane above

basilar membrane below

Organ of Corti Function steps (3)

1. waves of a certain frequency will cause specific regions of the basilar membrane to move

2. causes the hair cells on organ of corti to push against the tectorial membrane above, stimualting the cell to send an A.P

3. A.P is sent along the cohclear nearve which merges w the vestibular nerve to make the CN VII (vestibulocochlear nerve)

Ear

Round window

prevents feedback by absorbing energy sound wave

Equilibrium

Static and Dynamic Equibrilium

static- sensation of body position

dynamic- sensation of rapid body movements