12CentralVisPath

12CentralVisPath - Central Visual Pathways • Overview of...

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Unformatted text preview: Central Visual Pathways • Overview of visual process Photoreceptor Bipolar cell Ganglion Cell Ganglion cell axons form the optic nerve Optic nerve projects to the brain vision light reflexes • Central Projections of Retinal Ganglion Cells Optic Nerve --> Optic Chiasma --> Optic Tract Retinogeniculostriate pathway LGN Major target for ON axons Located in thalamus LGN neurons project via optic radiation to primary visual cortex (striate cortex) in optic lobe of brain Main pathway for what we think of as vision Figure 12.1 Central projections of retinal ganglion cells Ventral view of brain • Pupillary light reflex pathway Pretectum --> Edinger-Westphal nucleus --> ciliary ganglion --> iris constrictor muscle Activation of muscle results in pupillary constriction Figure 12.2 The circuitry responsible for the pupillary light reflex (Part 1) Figure 12.2 The circuitry responsible for the pupillary light reflex (Part 2) • Retinohypothalamic pathway Circadian rhythms Suprachiasmatic nucleus • Retinotopic representation of the visual fields Images are inverted on the retina Figure 12.3 Projection of the visual fields onto the left and right retinas (Part 1) Figure 12.3 Projection of the visual fields onto the left and right retinas (Part 2) Figure 12.3 Projection of the visual fields onto the left and right retinas (Part 3) Figure 12.4 Binocular field of view onto two retinas and relation to crossing of fibers in optic chiasm Figure 12.5 Visuotopic organization of the striate cortex in the right occipital lobe (Part 1) Figure 12.5 Visuotopic organization of the striate cortex in the right occipital lobe (Part 2) Figure 12.6 Consequences of damage at different points along the primary visual pathway Figure 12.7 Course of the optic radiation to the striate cortex http://anatomy.uams.edu/AnatomyHTML/atlas_html/eye_38.html •...
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12CentralVisPath - Central Visual Pathways • Overview of...

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