lecture 15 notes - Lecture 15, October 25, 2007 The Eye and...

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Lecture 15, October 25, 2007 The Eye and Retina lens and cornea: their role in accomodation zonula fiber stretch an elastic lens, zonula fiber attachments can be changed by contracting ciliary muscle, accommodation Defects in accommodation: myopia, hyperopia, presbyopia the iris and its control of the amount of light entering the eye, a role in adaptation to different light intensities. iris controls the pupil size meridonal fibers innervated by the sympathetic ns cause the pupil to dilate circular muscle fibers innervated by the parasympathetic ns cause the pupil to constrict bella donna retina, layers of cells: photoreceptors, horizontal cells, bipolar cells, amacrine cells, ganglion cells; the latter have axons that course across the surface of the retina to the optic disc, form the optic nerve, optic chiasm visual pathways major projection to thalamus, from thalamus onto occipital or visual cortex. consequence of exit from eye:
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This note was uploaded on 06/17/2008 for the course BIO 365R taught by Professor Draper during the Fall '08 term at University of Texas at Austin.

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lecture 15 notes - Lecture 15, October 25, 2007 The Eye and...

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