Superior rectus muscle

The video tutorial explores the superior rectus muscle, one of the six extraocular muscles responsible for eye movement. It details the muscle's actions, including elevation, intorsion, and adduction, and explains how these actions vary during abduction and adduction of the eye. The anatomy of the muscle is covered, highlighting its origin from the annulus of Zinn and its insertion on the anterior superior surface of the eye. The tutorial also discusses the muscle's blood supply from the anterior ciliary arteries and its innervation by the superior branch of the oculomotor nerve. Clinical relevance is noted, particularly in cases of severe orbital trauma.

Which of the following actions is NOT produced by the superior rectus muscle during adduction?

• Abduction

• Intorsion

• Elevation

• Adduction

What is the annulus of Zinn?

• A type of eye movement

• A ring surrounding the optic nerve

• A nerve in the eye

• A muscle in the eye

Where does the superior rectus muscle insert?

• On the posterior surface of the eye

• On the anterior superior surface of the eye

• On the inferior surface of the eye

• On the lateral surface of the eye

Which artery supplies blood to the superior rectus muscle?

• Ophthalmic artery

• Lacrimal artery

• Central retinal artery

• Anterior ciliary arteries

Through which structure does the oculomotor nerve enter the orbit?

• Optic canal

• Inferior orbital fissure

• Superior orbital fissure

• Annulus of Zinn