BIOLOGY 2C03 Lecture Notes - Olivary Body, Bony Labyrinth, Nucleus Accumbens
28 Jan 2013
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Document Summary
Laboratory 12: visual system: sclera and cornea are continuous connective sheets that form the perimeter of the eyeball. Intranuclear ophthalmoplegia uncoordinated mvmts of eye due to an interruption of mlf at level btw vi and iv: reflexive movement of eyes in response to mvmt of head/body, and consequenct activation of the vestibular system. Intrinsic musculature and autonomic neurons smooth muscles in iris and ciliary body: dilator pupillae (of iris) control size of pupil. Receive sympathetic (adrenergic: sphincter pupillae constricts pupil and innervated by parasympathetic (cholinergic) innervation from superior cervical ganglion neurons. Preganglionic neurons are in edinger-westphal nucleus, which is a part of fibers from ciliary ganglion. Iiird nerve complex in mb: ciliary body , retina. At rest: there is resting tension on zonular fibers (suspensory ligaments) it keeps the lens flat so eye focuses on distant objects. Light absorbed causes closure of na channels, hence hyperpolarization.
