PSYB51H3 Chapter Notes - Chapter 9&10: Vestibular System, Vestibular Duct, Bony Labyrinth
Document Summary
Decibels define the difference between two sounds as the ratio between two sound pressures. The tympanic membrane vibrates in response to sound: outer ear: the external sound-gathering portion of the ear, consisting of the pinna and the ear canal, middle ear: an air-filled chamber containing the middle bones, or ossicles. The middle ear conveys and amplifies vibration from the tympanic membrane to the oval window: ossicles: three tiny bones of the middle ear: malleus, incus, and stapes, malleus: one of the ossicles. The malleus receives vibration from the tympanic membrane and is attached to the incus: incus: the middle ossicle. The incus connects the malleus and the stapes: stapes: one of the ossicles. The tympanic canal extends from the round window at the base of the cochlea to the helicotrema at the apex. Also called scala tympani: vestibular canal: one of three fluid-filled passages in the cochlea.