VAN 121: Veterinary Gross Anatomy-II (2+2)

Trochlear nerve

TROCHLEAR NERVE (MOTOR)

• It is the motor nerve to the superior oblique muscle of the eyeball. It is the finest of the cranial nerves.
• It arises from the dorsal aspect of midbrain close to and behind the corpora quadrigemina where the anterior cerebellar peduncle enters the midbrain.
• The nerve passes forward and outward along the lateral border of the fifth cranial nerve, through the cavernous sinus and leaves the cranium through the foramen orbitorotundum and supplies the superior oblique muscle of the eyeball.