BIO 211 Lecture Notes - Lecture 32: Semicircular Canals, Vestibular System, Vestibulocochlear Nerve
15 Sep 2020
School
Department
Course
Professor
Document Summary
Detects changes in motion and position of head. Detects changes in rate of linear movement. Semicircular canals set at right angles to each other. Only detects changes in rate of rotation (bending) Example: why some people get more nauseous on a rollercoaster because different movement in the head (fluid) moves. Movements of cupula push against stationary fluid = bending of cilia. Example: gymants have bigger semicircular canals than normal people. Rotation makes the endolymph circulation, pushing the cupula and bending the hair cells. Otoliths- crystals found in gelatinous substance covering stereocilia. Utricle (moving your head saying no : horizontal, head tilt. Saccule (saying yes : vericle, moving on an elevator. Involves 2 aspects: identification of the sounds ( what , localization of the sounds ( where ) or where is it located. Sounds waves- air molecules: traveling vibrations of air, consist of alternate regions of compression and refraction of air molecules.
