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14 Cards in this Set
- Front
- Back
Lateral boundary of the Orbit |
Lateral Wall by 1) Frontal process of Zygomatic Bone 2) Greater Wing of Sphenoid |
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Roof boundary of the orbit |
Roof by 1) Orbital plate of Frontal bone 2) Lesser wing of Sphenoid bone |
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Medial boundary of the orbit |
Medial wall by 1) Maxilla 2) Lacrimal bone 3) Ethmoid bone 4) Body of the Sphenoid |
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Floor boundary of the orbit |
Floor by: 1) Orbital process of palatine 2) Maxilla (orbital surface) 3) Zygomatic bone |
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Contents of the orbit |
1) Eyeball 2) Orbital and Bulbar fascia 3) Muscles 4) Vessels 5) Nerves 6) Lacrimal Gland 7) Fat |
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Two groups of muscles of the eye |
A) Voluntary B) Involuntary |
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Voluntary Muscles of the Eye (7 muscles in each eye) |
A) Four recti 1) Superior, 2) Inferior, 3) Lateral, 4) Medial B) Two Oblique 1) Superior Oblique, 2) Inferior Oblique C) One levator 1) Lavetor Palpebrae superioris |
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Extra Ocular Muscles of the eye |
Four recti (Superior, Inferior, Lateral, Medial) Two Oblique (Superior Oblique, Inferior Oblique) |
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Involuntary muscles of the eye (3 muscles in each eye) |
1) Superior Tarsal 2) Inferior Tarsal 3) Orbitalis
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Vessels in the orbit |
1) Opthalmic artery 2) Superior and Inferior Opthalmic Veins 3) Lymphatics |
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Nerves in the orbit |
1) Optic 2) Occulomotor 3) Trochlea 4) Branches of opthalmic nerve 5) Abdjucent 6) Sympathetic nerve |
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Nerve supply of the muscles in the orbit |
All striated OCULAR muscles are supplied by oculomotor nerve (3rd cranial nerve) except Lateral Rectus and Superior Oblique Lateral rectus is supplied by abdjucent nerve (6th cranial) and superior oblique by trochlear (4th cranial nerve) |
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Effects of Occulomotor Nerve palsy |
a) Ptosis / Drooping of upper eyelid due to paralysis of levator palpebrae superioris b) External Strabismus (Squint) due to unopposed action of lateral rectus c) Dilated and fixed pupil d) Loss of accomodation e) Protrusion of Eyeball due to flaccid paralysis of most ocular muscles f) Diplopia |
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What is Exopthalmos? |
Abnormal protrusion of the eye due to flaccid paralysis of most occular muscle |