Extra-ocular Eye Muscles

Question 1

What is the innervation of the lateral rectus?

Answer 1

Abducens (CN 6)

Question 2

Why is the innervation of the Medial rectus?

Answer 2

Oculomotor (CN 3)

Question 3

Name the 3 actions of Superior rectus

Answer 3

Elevate, adducts and intorts

Question 4

Name the 3 actions of the inferior rectus

Answer 4

Depress, adducts and exorts

Question 5

Name the 3 actions of the superior oblique

Answer 5

Depress, abduct and intorts

Question 6

Name 3 actions of the Inferior oblique

Answer 6

Elevate, abduct and extort

Question 7

Which muscles need to have the eyeball medially adducted first before testing?

Answer 7

Superior oblique and Inferior oblique

Question 8

Which muscles need to have the eyeball laterally abducted first before testing?

Answer 8

Superior rectus and Inferior rectus

Question 9

Which nerve innervates most of the extra-ocular eye muscles?

Answer 9

Oculomotor (CN 3)

Question 10

Which muscle does the trochlear nerve innervate?

Answer 10

Superior oblique muscle only

Question 11

Which muscle does the abducens nerve innervate?

Answer 11

Lateral rectus