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Orbit

Orbit. Pair of bony cavities that contain the eye balls Eyelids Upper surface covered by skin and the inner surface covered by mucous membrane, the conjunctiva. The recti. The four recti arising from the fibrous ring called common tendinous ring. Sclera Nerve supply:

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Orbit

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  1. Orbit

  2. Pair of bony cavities that contain the eye balls • Eyelids • Upper surface covered by skin and the inner surface covered by mucous membrane, the conjunctiva.

  3. The recti • The four recti arising from the fibrous ring called common tendinous ring. • Sclera • Nerve supply: • Superior,inferior and medial recti are supplied by the oculomotor nerve; • Lateral recti by the abducent nerve(LR6).

  4. The oblique muscles • Superior oblique: • Body of sphenoid to medial aspect of superior surface of sclera thru a pulley • Trochlear nerve(SO4) • Downward and laterally • Inferior oblique: • Anterior part of floor of he orbit • Oculomotor nerve • Upward and laterally

  5. Sphinchterpupillae of iris • Parasympathetic via oculomotor • Constricts pupil • Dilator pupillae of iris • Sympathetic • Dilates pupil

  6. Ciliary muscle: • Parasympathetic via oculomotor • Controls shape of lens

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