Orbit Flashcards
Bones Surrounding Orbit
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Boundaries of Orbit
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Orbital Contents
(5)
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Eyeball
Fat and connective tissue
Extraocular muscles
Nerves
Blood Vessels
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Tarsal Plates
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Dense connective tissue
Support eyelid
Glands
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Orbital Ligaments
Suspensory
Check
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Support eyeball
Restrict medial and lateral recti
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Eyeball
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Aqueous Humour
Anterior to lens and helps mainain intra-ocular pressure
Produced by ciliary body and drains inot Schlemms canal at corneo-scleral junction
Vitreous Humor
(4)
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Embryological
Transparent jelly
Posterior to lens
Supports retina
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Intraocular (intrinsic) muscles - Dilator Pupillae
Function
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Increases diameter of pupil
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Intraocular (intrinsic) muscles - Dilator Pupillae
Innervation
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Sympathetic and carried on blood vessels
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Intraocular (intrinsic) muscles - Sphincter Pupillae
Function
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Decreases pupil diameter
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Intraocular (intrinsic) muscles - Sphincter pupillae
Innervation
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Parasympathetic via oculomotor nerve CN III
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Extraocular (extrinsic) muscles
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7 of them
Levator palpebra superioris
Superior, inferior, medial and lateral recti from annular ring to sclera
Superior oblique and inferior oblique to sclera
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Orbital Muscles
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Optic Nerve and Visual Cortex
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