04 -- 402_S2009_Vision Homework

04 -- 402_S2009_Vision Homework - Nikhil Patel Psych 402 -...

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Nikhil Patel Psych 402 -- 001 1. The retina is really composed of several layers of neural cells.  The photoreceptors are   in the very back of the eye.  Why might some say this is an “odd” design?  And why is  the retina designed this way? Light must travel through the first few layers of cells to stimulate the photoreceptors;  however this works because the epithelial in which the photoreceptors are embedded aid their  metabolism. 2. Why does the arrangement of the retinal cells not impede acuity? The ganglia, horizontal, acrimal, and bipolar cells are not very dense, unmyelinated, and  are transparent. 3. At what point (photoreceptors? bipolar neurons? ganglion cells?) are action potentials  possible? Action potentials first occur at the ganglion cells. 4. What’s the difference between ciliary muscles and extraocular muscles? Ciliary muscles are intraocular and control the shape of the lens whilst extraocular 
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This note was uploaded on 03/23/2009 for the course PSYC 402 taught by Professor Jenniloeb during the Spring '09 term at UNC.

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04 -- 402_S2009_Vision Homework - Nikhil Patel Psych 402 -...

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