NervSys1(4)

NervSys1(4) - General Biology 101 Dr. Morrison Lecture: The...

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General Biology 101 Dr. Morrison Lecture: The Nervous System Question #1 How does your brain know what you are looking at? The Eye and the Brain See video (25 minutes) Key points: Outer eye Defenses (lid, tears, oil) Cornea: 3 layers (middle elastic, outer renewing), blood vessels stop at edge. Iris: goddess of the rainbow, its muscles regulate pupil size Key points: Inner eye Aqueous humor: bathes inner cornea and lens, flows through pupil. Vitreous humor: jelly fills and supports eyeball between lens and retina. Retina: rods and cones, fovea (the pit); retina analyzes image into components Image perception Image analyzed into, and then reconstructed from, four components: Shape (lines and edges) Color (RGB) Motion Depth Brain “constructs” visual reality No single replica of image in brain Abstract, symbolic descriptions Four main components of image Stored in 32 visual processing centers Synchronous firing may “link” neurons? Approaches to brain research Reductionism attempts to understand brain function at level of neurons. Holistic approach asks, “How is the system organized?” Nervous System -- 1
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Anatomy of a neuron Dendrites: carry graded electrical impulses toward the cell body. Axon: carries all-or-nothing impulses away from the cell body. Synaptic end bulbs: A typical (motor) neuron
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This note was uploaded on 09/28/2010 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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NervSys1(4) - General Biology 101 Dr. Morrison Lecture: The...

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