Lec21 - The Reason Ears Were Invented • The original...

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Unformatted text preview: The Reason Ears Were Invented • The original function in evolution? ….Equilibrium, coordination and balance. • The VESTIBULAR APPARATUS : This is where we find Equilibrium Receptors. • Like the hearing “apparatus” in the cochlea the VA has HAIRS too. The hairs work a little differently but the result is the same we get TRANSDUCTION: this time we will transduce motion into nerve impulses. Equilibrium • Control of coordination and balance • Receptors in vestibular apparatus – semicircular ducts contain crista – saccule and utricle contain macula • Gravitational equilibrium – perceived by macula – perception of head orientation • Dynamic or ROTATIONAL equilibrium – perception of motion or acceleration • linear acceleration perceived by macula • angular acceleration perceived by crista We Have 2 Types of Equilibrium: GRAVITIONAL and ROTATIONAL • GRAVITATIONAL; Mechanoreceptors in utricle and saccule detect movement of the head in vertical and horizontal planes. • ROTATIONAL: Mechanoreceptors in semicircular canals detect rotational /angular moment of head. For Our Gravitational Equilibrium • Each MACULA has set of HAIRS embedded in otolithic membrane, a gel- like material has earstones called OTOLITHS • OTOLITHS are calcium salts that rolls in response to change in GRAVITY. Hair cells project into membranous labyrinth...
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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Lec21 - The Reason Ears Were Invented • The original...

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