Superior Rectus Muscle

Superior Rectus Muscle

Question 1. Superior rectus muscle of eyeball and it’s action
Answer:

• Superior rectus muscle of eyeball is an extraocular muscle of orbit
• Superior rectus muscle of eyeball has origin in the back of the orbit in a fibrous ring called the annulus of Zinn.
• This ring is attached to the orbital surface of the apex of the orbit.
• The fibres are inserted into the sclera posterior to the limbus
• Superior rectus muscle of eyeball is supplied by the superior branch of oculomotor nerve.

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Superior rectus muscle of eyeball  Actions:

• Elevation
• Adduction
• Intortion

Superior rectus muscle of eyeball Applied anatomy:

• Superior rectus muscle of eyeball is the only muscle that is capable of elevating the pupil when it is in a fully abducted position.

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Question 2. Optic canal
Answer:

• Optic canal leads to the orbit
• Optic canal is bounded
  • Laterally by lesser wing of sphenoid
  • Front and behind by the two roots of the lesser wing
  • Medially by the body of sphenoparietal
• Structures passing through it are:
  • Optic nerve
  • Ophthalmic artery.

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Question 3. Functional components of oculomotor nerve.
Answer:

Functional components of oculomotor nerve are:

• General somatic efferent
• General visceral efferent
• General somatic afferent

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