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9 Cards in this Set
- Front
- Back
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Dimensions of eyeball |
Anteroposterior diameter = 24 mm Horizontal diameter = 23.5 mm Vertical diameter = 23 mm Volume = 6.5 ml Weight = 7 gm
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Coats of eyeball |
Outer Fibrous coat: Anteriorly 1/6th part (transparent):Cornea Posteriorly 5/6th part (opaque): Sclera Corneoscleral junction: Limbus Middle Vascular coat: Contains iris, ciliary body & choroid. Inner Nervous coat: Retina |
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Segments of eyeball |
Anterior segments Posterior segments |
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Anterior segments |
Upto lens and further divided into: i) Anterior chamber: bounded anteriorly by back of cornea & posteriorly by anterior surface of iris & ciliary body. Contains about 0.25 ml of aqueous humor. ii) Posterior chamber: bounded anteriorly byposterior surface of iris & part of ciliary body,posteriorly by crystalline lens & zonules &laterally by ciliary body. Contains about 0.06ml aqueous humor.
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Posterior segments |
Behind the lens& includes vitreous humor, retina, choroid & optic disc. |
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Blood supply |
Arteries:Ophthalmic artery (branch of internal carotidartery) branches include short ciliary artery, long ciliary artery, central retinal artery
Veins: Central retinal vein which drains from retina, Anterior ciliary vein, short posterior ciliary veins & venae verticosae which drain from uveal tissue Superior ophthalmic vein, inferior ophthalmic,middle ophthalmic, medial ophthalmic veins |
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Nerve supply |
Sensory nerves Motor nerves |
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Sensory nerves |
Ophthalmic nerve: smallest (3rd) trigeminal nerve whose branches are: Lacrimal nerve Frontal nerve Nasociliary nerve
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Motor nerves |
All the extraocular muscles of eye are supplied by oculomotorr nerve (third cranial nerve) except lateral rectus (6th cranial nerve) & superior oblique(4th cranial nerve) @ LR6S04 7th cranial nerve (Facial nerve) branches supply orbicularis oculi |
