LING 3P97 Lecture Notes - Lecture 3: Saccule, P21, Tectorial Membrane
15 Jan 2016
School
Department
Course
Professor
Document Summary
Ling 3p97 lecture 4: anatomy and function of the inner ear. Semicircular canals (superior, lateral, posterior; arranged at 90degrees to one another); vestibule (sensory organs); cochlea. Mechanical vibrations from middle ear transduced to pressure variations (fluid) and eventually to neural impulses in the auditory branch of the 8th nerve. Need pressure wave to move fluid in cochlea. Due to small size of cochlea, vibrations received instantaneously. Apical turn at the apex is the smallest. Scala vestibule has perilympth (has more sodium, low in potassium) Scala media (houses true hearing organs) (completely separate) has endolympth (low in sodium potassium helps with electrical signal) Scala tympani (connects with scala vestibule) - perilymph. Fig 1. 12 pg 16 and 1. 16 pg 21. Drives transmission of sounds; responds to pressure wave. Goes from thin (basal portion) to thick towards apex (opposite of cochlea) Base closest to outside of ear is stiff which increases frequency wide and flaccid at other end does low frequency sounds.
