The groove on the upper surface of the sphenoid bone running transversely between the [[optic canal]]s bounded anteriorly by the sphenoidal limbus and posteriorly by the [[tuberculum sellae]]; forms in relationship to the [[optic chiasm]].
Synonym(s): [[sulcus prechiasmaticus]] [TA], [[chiasmatic groove]], [[chiasmatic sulcus]], [[optic groove]]