Vision - Slide 1 Visual System Slide 2 Visual system...

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Unformatted text preview: Slide 1 Visual System ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 2 Visual system anatomy - Eyeball • Sclera • Conjunctiva • Cornea • Iris • Pupil • Lens – Accomodation ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 3 Visual system anatomy - Retina • Retina – the lining at the back of the eye; contains photoreceptors • Rods • Cones – Fovea mediates most acute vision – Optic disk • Blind spot – no receptors ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 4 Visual system anatomy - Retina • Retinal layers 1. Photoreceptor layer 2. Bipolar layer – contains: – Bipolar cells – Horizontal and amacrine cells 3. Ganglion cell layer – axons = optic nerve ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 5 Photoreceptors • Contain molecules of photopigments – Each molecule consists of an opsin and a retinal • Change in the membrane potential • NT released – Photoreceptors secrete NT constantly; rate determines the message ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 6 Primary visual pathway 1. Each eye receives stimulation from both halves of the visual field 2. Receptor cel s in the left half of each retina respond to stimuli in the right visual field 3. Retinal ganglion cel axons combine in the optic nerve 4. At the optic chiasm, axons from the medial halves of the retina cross; axons from the lateral halves continue to the ipsilateral hemisphere ___________________________________ ___________________________________...
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This note was uploaded on 10/01/2008 for the course PSYCH 202 taught by Professor Kim during the Winter '06 term at University of Washington.

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Vision - Slide 1 Visual System Slide 2 Visual system...

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