Image Based Question – 73744

The nerve supplying the superior oblique muscle exits the brainstem at which of the following sites:

A. A

B. B

C. C

D. D

Correct Answer » A Explanation

Ans: A. A

(Ref: Gray’s 41 /e p547, 40/e p539).

Protrusion of jaw:

• Carried out by bilateral action of lateral pterygoid muscle.
• Represented by ‘A’ in diagram.

Origin:

• By two heads from sphenoid bone.

Insertion:

• at anterior surface of mandibular condyle.