Myology, Neurology, Angiology and Aesthesiology: Optic nerve

Optic nerve

OPTIC NERVE (SENSORY)

It is a nerve of sense for sight. This nerve is composed of medullated fibres devoid of neurilemma which are axons of the ganglion cells of retina.
The fibres converge within the eyeball at the optic papilla, where they form the optic nerve.

Distribution of III, IV &VI cranial nerves

FOR-Foramen orbito rotundum, LPS-Levator palpebrae superioris, DR-Dorsal rectus, MR-Medial rectus, VR-Ventral rectus, SO-Superior Oblique, IO-Inferior oblique, RO-retractor oculi, Cg-Ciliary ganglion

Note: The ciliary ganglion relays parasympathetic fibres to ciliary muscles and constrictor pupillae

Then it pierces through the choroid and sclera, emerges from the inferio-lateral quadrant of the eye and passes backward and inward to the optic foramen.
On entering the cranium the two nerves decussate at the base of the brain and form the optic chiasma or commissure.
From the optic commissure, the optic tract passes into the lateral geniculate body and anterior quadrigeminal body.
The sheath of the nerve is formed by the prolongation of the meninges of the brain.

Last modified: Wednesday, 2 May 2012, 7:00 AM

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

Optic nerve

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