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

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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 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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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 cells in the left half of each retina respond to stimuli in the right visual field 3. Retinal ganglion cell 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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