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).
ethmoid 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, |
|Anatomical terms of bone|
- figures/chapter_42/42-18.HTM: Basic Human Anatomy at Dartmouth Medical School
- Anatomy image: skel/internal2 at Human Anatomy Lecture (Biology 129), Pennsylvania State University (#7)