ANAT 2647 The Visual System - PNS Version

ANAT 2647 The Visual System - PNS Version - Outer nuclear...

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David H. Hubel and Torsten N. Wiesel 1981 Nobel Prize for Physiology and Medicine (had to share with Roger Sperry) for their discoveries concerning "visual system".
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Fibrous Layer Tough outer layer Gives eyeball its shape Sclera (white of the eye) Posterior 5/6 th opaque Eye muscles attach Cornea Anterior 1/6 th transparent
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Vascular Layer Choroid Pigmented Highly vascularized Ciliary body Ciliary processes secretes aqueous humor Ciliary muscle bends the lens Continuous with the Choroid Attaches to the lens Iris Aperture is the pupil Colored part of the eye
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Retina Non-optic part Optic part Pigmented Unpigmented (neural) Optic disc – “blind spot” Macula lutea – “yellow spot” Fovea centralis Area of highest visual acuity
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Retinal Cell Types Photoreceptors rods cones bipolar neurons ganglion cells - optic nerve horizontal cells - fine tuning amacrine cells - contrast enhancement; motion detectors
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Retinal Layers
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Unformatted text preview: Outer nuclear Outer plexiform Inner nuclear Inner plexiform Ganglion cell Targets Lateral geniculate body Superior colliculus eye movement Pretectal areas pupillary light reflex Suprachiasmatic nucleus sleep/wake cycle Tracts Optic nerve, optic chiasm, optic tract optic radiation (geniculocalcarine tract) meyers loop Lateral Geniculate Body The first two lamina are magnocellular and detect movement. The remaining four lamina are parvocellular and detects color and form Laminae 1,4,6 receive contralateral input Laminae 2,3,5 receive ipsilateral input Visual Cortex The visual cortex is in the occipital lobe and surrounds the calcarine sulcus (Area 17) Input from LGN terminates in lamina 4 Alternating columns of ipsilateral or contralateral inputs Neurons in lamina 4 project to the other laminae...
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ANAT 2647 The Visual System - PNS Version - Outer nuclear...

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