Week 130 - Muscles of the Eye

Question 1

What is the Nerve Supply and Action of Superior Rectus muscle?

Answer 1

Action: Raises cornea upward and medially

Nerve Supply: Oculomotor

Question 2

What is the Nerve Supply and Action of Inferior Rectus muscle?

Answer 2

Action: Depresses cornea downward and medially

Nerve Supply: Oculomotor

Question 3

What is the Nerve Supply and Action of Medial Rectus muscle?

Answer 3

Action: Rotates eyeball medially

Nerve Supply: Oculomotor

Question 4

What is the Nerve Supply and Action of Lateral Rectus muscle?

Answer 4

Action: Rotates eyeball laterally

Nerve Supply: Abducent

Question 5

What is the Nerve Supply and Action of Superior Oblique muscle?

Answer 5

Action: Rotates eyeball downward and laterally

Nerve Supply: Trochlear

Question 6

What is the Nerve Supply and Action of Inferior Oblique muscle?

Answer 6

Action: Rotates eyeball upward and laterally

Nerve Supply: Oculomotor

Question 7

What is the Nerve Supply and Action of Sphincter pupillae of iris?

Answer 7

Action: Constricts pupil

Nerve Supply: Parasympathetic (via oculomotor)

Question 8

What is the Nerve Supply and Action of Dilator of iris?

Answer 8

Action: Dilates Pupil

Nerve Supply: Sympathetic

Question 9

What is the Nerve Supply and Action of Ciliary muscle?

Answer 9

Action: Controls shape of lens

Nerve Supply: Parasympathetic (via oculomotor)

Question 10

What is the Nerve Supply and Action Levator palpebrae superioris?

Answer 10

Action:Raises upper lid

Nerve Supply: Striated muscle - oculomotor, smooth muscle - sympathetic