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Arises from to infraorbital margin medially and runs

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arises from to infraorbital margin (medially) and runs tothe temporal surface of the eye ballAction:rotates the upper half of eye ball towards the temporal side
Structure of the EyeCornea:anterior surface;transparentLens:Posterior to the iris which hasa central opening, the pupilOptic nerve:posterior; medial to theoptic axisChambers:Anterior Chamber:bordered bycornea, iris and lens, which has aclear fluid,Aqueous humorPosterior Chamber:lies in a ringaround lens, also contains theAqueous humorInterior (vitreous) chamber:containsVitreous body,a jelly likesubstance containing water
Structure of the EyeWall contains 3 layers:Sclera, Uvea and RetinaSclera:dense taut connective tissuecapsule ofcollagen and elastic fibers;maintains the shape of eyeball along withintraocular pressureUvea:contains blood vessels; forms theirisandciliary bodyin the anteriorchamber and thechoroidin the interiorchamber•High pigment within the iris isresponsible for brown eyes, low pigmentis responsible for blue or green eyesMacula:region of greatest visual acuity,yellowish in color and has a central pit(fovea centralis)
Function of the Eye•Anterior/Posterior Chambers: have an image-projecting apparatus, the refracting lenssystem•Interior Chamber: contains retina•Together, they work like a cameraLens system, diaphragm (iris), andlight sensitive film (retina)
Vascular Supply of the EyeCiliary arteriesCentral retinal arteryBoth arising from Ophthalmic artery
Fundus Of the Eye (Interior Surface)•Examined by ophthalmoscope through pupil, reddish in color•Pupilla of optic nerve is where all nerve fibers collect here to leave the retina, also known asthe optic disk or blind spot; central artery divides here
Retina•Consists of 4 layers of nerve and other supporting cells•Light passes through these layers to reach the photoreceptorsA- first layer: nerveaxonsthat collect at optic diskB- second layer: ganglion cellsC- third layer: Bipolar cellsD- light sensitive Rods and Cones (neuroepithelium)Pigmented epithelium
Optic Pathway
Clinical NotesDirect and Consensual light reflex:constriction of ipsilateral and contralateralpupil when a light is shone into one eye. It shows the function of CN III and also theoptic pathway. These reflexes may be lost in head trauma.Pupillary dilation due to CN III palsy may be due to tumors or an aneurysmCataract:progressive degeneration and opacity of the lens which leads to impairedvision and blindness; due to the deposition of aggregated proteinsGlaucoma:optic neuropathy, retinal ganglion cell loss, and blindness due to impaireddrainage of the aqueous humor from the Schlemm’s canal. Leads to increased intraocular

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Term
Fall
Professor
SAMSAM
Tags
Facial nerve

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