Communication Sciences and Disorders 4417A/B Study Guide - Final Guide: Railways Act 1921, Phenome, Sensorineural Hearing Loss

• School: Western University
• Department: Communication Sciences and Disorders
• Course: Communication Sciences and Disorders 4417A/B
• Professor: Ewan Macpherson

Document Summary

In humans and most mammals there"s one row of inner hair cells and three of outer. The bm goes up and down in response to pressure signals varying across it. The tectorial membrane is gelatinous and its hairs bend when the bm moves. Nerve fibers come off outer and inner hair cells. Up to 5 rows of ohc 12000 cells. The up and down motion of the bm causes shearing motion of tectorial membrane. For the most part the ihc are sticking out into the endolymph. Row of ihc along entire length of bm. The tips of the stereocilia of the ohc are embedded in the tectorial membrane. Ohc change the mechanical properties of the tm to sharpen frequency responses. The bm analyses sound into spectral components. Ihc transduce mechanical vibration into electrical activity in the auditory nerve. Inner tunnel of corti is filled with cortilymph.