EAR.

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Presentation transcript:

EAR

Outer Ear Function Pinna External auditory meatus (canal) Ceruminous glands Tympanic membrane Eardrum

Middle Ear Auditory = Eustachian tube Ossicles Oval window Malleus Incus Stapes Oval window Round window

Inner Ear Osseous labyrinth filled with perilymph Membranous labyrinth filled with endolymph

Inner Ear Vestibule Utricle Saccule

Inner Ear Semicircular canals Semicircular ducts

Inner Ear Cochlea Vestibular Membrane Basilar membrane Cochlear duct (endolymph)

Inner Ear - Cochlea Scala tympani Scala vestibuli Spiral Organ = Organ of Corti Receptors for hearing are hair cells on the basilar membrane in the Spiral Organ

Hearing Sound transmission High frequency at base of cochlea Tympanic Reflex High frequency at base of cochlea Low frequency at apex of cochlea

Hearing Auditory pathway

Hearing Pitch determination (20-20,000 cps)

Hearing Loudness 1-120 db

Hearing Localization of sound Time reaching ear and loudness for both ears

Equilibrium Utricle and Saccule Macula = receptor Otolith Linear Acceleration Linear Deceleration Head Position

Equilibrium Semicircular ducts with ampulla- widened part Crista – hair cells Cupula = endolymph Rotational acceleration Rotational deceleration Vestibular nystagmus

Equilibrium Dynamic whole body equilibrium