L12_sensory2_11COLOR

L12_sensory2_11COLOR - Mechanoreception The...

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Mechanoreception – The acoustico-lateralis system 1) Inner ear for hearing 2) Inner ear for equilibrium/balance 3) Neuromast/lateral line system
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How? Displacement detector – consists of a bundle of hairs / hair cells encapsulated by cupola Cupola with endolymph may or may not surround hair cells Sound vibration / water motion causes fish to move, otolith or endolymph lags, some hair cells are bent, transmission of electrical nerve impulse to brain detected as sound / motion Pattern and direction of vibration impart information Neuromast organs are hair cells grouped together (few to 1000’s) Neuromasts found in lateral line, ampullae of semi-circular canal (ampulla = fluid-filled inertia-sensing chamber), and in otolith sacs
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See Figs. 6.1 and 6.4 in Text
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• Cupola increases sensitivity and enhances the ability of the hair cells to detect a stimulus
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Hearing and balance 3 semi-circular canals each with an ampulla Pars superior / (ampulla = fluid-filled inertia-sensing for balance chamber) 1 sac with earstone - otolith utriculus with lapilli (sing. = lapillus) 2 sacs with otoliths Pars inferior / for hearing - sacculus with sagittae (sing. = sagitta) - lagena with asterisci (sing. = asteriscus) Swimbladder = amplifier (gas is more easily compressed by sound pressure wave)
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Pars superior (Balance) Pars inferior (Hearing)
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- Pars inferior - Sound vibrations in the near field impinge on fish: whole fish moves to and fro from particle displacement of water. Otoliths are 3x more dense than the fish, so lag behind in their sacs/chambers due to inertia - Otoliths suspended in fluid and surrounded by hair cells: different phase and amplitudes of motion cause otoliths to bend cilia which stimulate neural transmission to auditory center Good for low frequency, high energy
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This note was uploaded on 01/10/2012 for the course EEMB 106 taught by Professor Staff during the Spring '08 term at UCSB.

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L12_sensory2_11COLOR - Mechanoreception The...

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