Nervous System - The Nervous System (Senses) Vision...

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The Nervous System (Senses)
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Vision Probably the most important sense in birds because … Eyes are very large (often larger than the brain!) Flying through vegetation…. http://www.youtube.com/watch?v=p-_RHRAzUHM
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How the eye functions Path of light Important differences from mammals: The Iris is striated (not smooth) muscle. Parrots. 2 hemispheres of different radius (next slide)
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Shape of eye This reduces weight and space, without sacrificing acuity. BUT, it’s not as structurally stable as a spherical shape.
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How the eye functions Important differences from mammals: The Iris is striated (not smooth) muscle. Parrots. 2 hemispheres of different radius Sclerotic rings
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How the eye functions Important differences from mammals: The Iris = striated (not smooth) muscle. Parrots. Structure = 2 hemispheres of different radius (next slide) Sclerotic rings Pectin Birds can’t move eyes in sockets very well
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Eye shapes Tradeoff: wide field of view (swan) vs. magnification and binocular vision (owl)
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This is an intermediate eye shape, with moderate field of view and binocular vision (area of visual overlap between the two eyes). Sound too abstract?
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This document was uploaded on 08/24/2011.

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Nervous System - The Nervous System (Senses) Vision...

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