Lecture 16 10-28-10

Lecture 16 10-28-10 - Lecture 16 Lecture Hearing...

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Lecture 16 Lecture 16 Hearing Hearing Photoreception & Vision Photoreception & Vision 28 October 2010 28 October 2010
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Mechanoreception Dorsal root ganglion cells are the touch receptors in mammalian skin.
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Mechanoreception Pacinian corpuscles responds to changes.
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Mechanoreception Merkel disks are tonic receptors. Pain receptors and muscle spindles are other examples of tonic sensory receptors.
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Mechanoreception Meissner’s corpuscles and Pacinian corpuscles are phasic receptors.
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Hair Cells
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Directional sensitivity derives from polarized array of sterocilia Hair Cells
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Hair Cells Ion channels associated with sterocillia are opened or closed, depending on the direction of displacement. Thus, directional selectivity.
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Hair Cells: Lateral Line System of Fishes
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Mammalian Ear Sound Reception
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Mammalian Ear Sound energy is transferred from air to liquid Pressure waves J J
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Mammalian Ear
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Mammalian Ear
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Mammalian Ear
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Mammalian Ear
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Localization of Sound Central Nervous Sytem compares the time and intensity of sound between the two ears. In owls, both horizontal and vertical sound localization.
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