Superior oblique muscle

This tutorial explores the superior oblique muscle of the eye, covering its origin, insertion, function, innervation, and blood supply. The muscle is one of the six extraocular muscles, specifically an oblique muscle, which influences eye movements. It originates from the annulus of Zin and inserts onto the eye's posterior superior lateral surface. The muscle is responsible for abduction, intorsion, and depression of the eye, providing stability by counteracting head movements. It is innervated by the trochlear nerve and receives blood supply from branches of the anterior ciliary arteries.

Which structure does the superior oblique muscle originate from?

• The lateral rectus muscle

• The trochlea

• The annulus of Zin

• The sclera

What is the primary role of the superior oblique muscle when the eye is in a neutral position?

• Abduction

• Adduction

• Elevation

• Extorsion

What is the function of the superior oblique muscle in terms of eye stability?

• It assists in voluntary eye movements.

• It enhances peripheral vision.

• It focuses the eye on distant objects.

• It counteracts head movements to prevent involuntary eye rotation.

Which cranial nerve innervates the superior oblique muscle?

• Abducens nerve

• Optic nerve

• Oculomotor nerve

• Trochlear nerve

From which artery do the branches supplying blood to the superior oblique muscle originate?

• Carotid artery

• Facial artery

• Ophthalmic artery

• Maxillary artery