Optic canal

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Optic foramen
Orbita mensch.jpg
Gray193.png
Base of the skull. Upper surface. (On the left, "Optic foramen" is the 12th label from the top.
Latin canalis opticus, foramen opticum ossis sphenoidalis
Gray's p.147
Anatomical terms of bone

The optic foramen is the opening to the optic canal.

The superior surface of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove (optic groove), above and behind which lies the optic chiasma; the groove ends on either side in the optic foramen, which transmits the optic nerve and ophthalmic artery (with accompanying sympathetic nerve fibres) into the orbital cavity.

The left and right optic canals are 25mm apart posteriorly and 30mm apart anteriorly. They are funnel-shaped (narrowest anteriorly).

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This article incorporates text from a public domain edition of Gray's Anatomy.