Vision CLINICAL VIGNETTE As a start to learning about the visual ...

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VisionRetinaPractice Questions- Answers626RETINAL STRUCTURE AND FUNCTION: PRACTICE QUESTIONANSWERS1. ganglion cell axons - Hhorizontal cells - Fphotoreceptors - Dganglion cell bodies - BMuller’s cells - Abipolar cells - Gretinal pigment epithelium - Coptic disc - E2. A - FB - TC - TD - TE - F3. D; and E (but just a little bit)4. A - rodsB - conesC - rodsD - conesE - rodsF - rodsG - conesH - conesI - conesJ - conesK - rods5. C, D, E6. D7. C8. A9. B (there are no photoreceptors at the optic disc)
627VisionCentral PathwaysCENTRAL VISUAL PATHWAYSNext we examine the central visual pathways, through the optic nerve to cortical structures,and see how these pathways map the visible world.Visual areas in the brain commonly contain an organized ‘map’ of the visual world.Understanding this visual mapping, “visuotopy”, is important for understanding the centralprojections of visual neurons and the deficits that accompany damage to central visual structures.We start by defining terms relating to the field of vision and visual topography.A. Visual Fields And Retinal CoordinatesThe visual field of an eye is the entire extent of the external world that can be seen withoutmoving the eye. Locations in the visual hemi-field (half-visual field) of an eye closer to the person’snose are referred to as the nasal field. Locations in the visual hemi-field closer to the temple are inthe temporal field. The visual field can also be divided into an upper half or superior field and alower half or inferior field. The combination of the two monocular fields is the binocular field.
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Vision CLINICAL VIGNETTE As a start to learning about the visual ...

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