Chiasmatic groove

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Chiasmatic groove
Sphenoid bone. Upper surface. (Sulcus chiasmaticus labeled at center)
Base of the skull. Upper surface. (Sphenoid bone is yellow; chiasmatic groove labeled at center left, fourth from the top of the labels near the yellow region.)
Latin Sulcus praechiasmaticus,
sulcus chiasmaticus
Gray's p.147
TA A02.1.05.005
FMA 75760
Anatomical terms of bone

The superior surface of the body 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, prechiasmatic sulcus), above and behind which lies the optic chiasma of cranial nerve 2 (the optic nerve).

The groove ends on either side in the optic foramen, which transmits the optic nerve and ophthalmic artery into the orbital cavity.

Chiasmatic groove


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

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