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

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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.
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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
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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.
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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.
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