PSYCH 3A03 Lecture Notes - Saccule, Ganglion Cell, Vestibular System

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3A03
• Professor: Paul Faure

Document Summary

Stapes motion causes motion of inner ear perilymph. Ultimately, this causes motion of the stereocilia of the hairells of the organ of. Endolymph: fluid on the inside of the chamber. When the haircells depolarize, neural impulses are evoked in the auditory nerve. Inner ear provides nervous system with infor about stimulus frequency, amplitude and time. Mechanics of inner ear filter incoming stimulus signal (low pass filter) 3 divisions inside temporal bone: semicircular canals, vestibule, cochlea. Semicircular canals open into the vestibule, utricle and saccule, structures for the sense of balance but which also receive mechanical auditory inputs (have haircells too) The cochlea, a coiled shell-shaped structure within the labyrinth of the temporal bone, is the 1o auditory organ (primary auditory organ) Keeping the structure stable in order to keep sensitivity to vibrations. Central spinal axis of cochlea is called modiolus. Spinal canal divided along length by osseous spiral lamina.