CHAPTER 21 : The Orbit and Eyeball


a) Optic nerve

Second cranial nerve.

Extends from the eye to the optic chiasma.

May be considered to be an extension of the brain

Has got three parts: Orbital, canalicular and intra cranial

Contains second order neurons

Sorrounded by meninges and tendons of extra ocular muscles

Traversed by central artery and central vein of retina


Note the optic nerve [1] , optic chiasma [2] and optic tract [3]