Anatomy Samsam Test 5 - EYE

orbital region
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Terms in this set (42)
Medial Rectus M.inserts to eye at nasal side (CNIII) produces adductionlateral rectus minserts to eye laterally temporal side (CNVI) ABDUCTIONsuperior oblique Minserts on eye superiorly by turning over trochlea (CNIV) rotates upper half of eye towards the noseinferior oblique m.arises from to infraorbital margin (medially) and runs to the temporal surface of the eye ball (CNIII) rotates the upper half of the eye fall towards temporal sidedouble visionparalysis of single eye muscleconvergencemedial recti muscles work togetherlateral gazemedial recti muscles become antagonistscavernous sinuscrainal 3,4,6 pass; internal carotid arteryophthalmoplegiathrombosis of the sinus or aneurysm of the artery may compress the nervescornealies on ant. surface of eye and is transparentlenslies behind the iris which has central opening (pupil)optic nerveemerges from the eye posteriorly, medial tot he optic axisanterior chamberbordered by corena, iris, and lends, which has clear fluid (aqueous humor)posterior chamberlies in a ring around lens, also contains aqueous humorinterior of eyecontains vitreous body; jelly like substance having waterscleradense taut connective tissue capsule of collagen and elastic fivers; maintains the shape of eyeball along with intraocular pressureuveacontains blood vessels and ford the iris and ciliary body in the anterior part of the eye and posteriorly it forms the choroidbrown eyehigh pigment in irisblue or green eyelow pigment in irisblood supply eyeciliary arteries and central retinal artery; both arising form opthalmic arteryfundus of eyecan be examined by opthalmoscope through pupil, reddish in color; central artery divides herepupil of optic nervesnerve fibers collect here to leave the retina; in nasal half of eye, whitish disk with central vavitymacularegion of greatest visual acuity, yellowish and has central pit (fovea centralis)retinaconsists of 4 layers of nerves and other supporting cells; light passes through these layers to reach the photoreceptorsfirst layernerve axis that collect at optic disksecond layerganglion cellsthird layerbipolar cellsfourth layerlight sensitive rods and cones (neuroepithelium)direct and consensual light reflexconstriction of ipsilateral and contralateral pupil when a light is shone into one eye; it shows the function of CNIII and also the optic pathway, these may be lost in head trauma, pupillary dilation due to CNIII palsy may be due to tumors, aneurysmscataractprogressive degeneration and opacity of the lens which leads to impaired vision and blindnessglaucomaoptic neuropathy, retinal ganglion cell loss, and blindness due to impaired drainage of the aqueous humor form the Schlemm's canal, leads to increased intraocular pressure and increased retinal blood flowpapilledemawhen the optic disk bulges out due to increased intracrainal pressure