Lecture 6

Lecture 6 - Horizontal Cells bipolar cells Amocrine cells...

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Lecture # 6: Vertebrate Vision I) Sensory Information a. Transduction Machinery a.i. “GP’s” in sensory neurons a.i.1. See previous lectures b. Madalities b.i. Pain /pressure/heat/cold/touch/taste/smell b.i.1. Via Protein coupled Receptors b.i.2. “Metabotrophic Receptors” 216-222 II) Mammalian Eye a. Anatomy b. Light Transduction b.i. Cell Types: Photoreceptors b.i.1. Rods: White/Black (very sensitive) b.i.2. Cones: color (blue/red/green) b.i.3. Outer Segment contains Rhodopsin b.i.3.a. A protein (opsin) + retinal (which absorbs light) b.ii. Molecular Mechanism b.ii.1. In the dark: cGmp holds Na channels open inward ion flow “dark current” (GTP GMP) b.ii.2. Cis Retinal See figure 50-22 c. Retina: 5 cell layers c.i. Photoreceptors (back of eye)
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Unformatted text preview: Horizontal Cells bipolar cells Amocrine cells retinal ganglian cells (RGCs) axons to brain (optic nerve) III) Visual System Pathway (Figure 50-24) IV)Receptive Fields a. That part of the sensory fields that affects one cell. eg Visual system RF=part of the visual field that changes that changes the electrical activity of the cell. PG 1104 Receptive Fields b. A Retinal Ganglian Cell Retinal Field b.i. On Center Off surround Retinal Ganglian cells c. Cells in visual cortex: Receptive Fields? c.i. RF= oriented bar of light in a specific region c.ii. Hypothesis Add center surround RFs of presypnatic neurons...
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This note was uploaded on 01/17/2012 for the course HILD 100 taught by Professor Lee during the Spring '11 term at UCLA.

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