Chiasmatic sulcus

The depression in the posterior part of the anterior cranial fossa where the optic chiasm perches.

The groove on the upper surface of the sphenoid bone running transversely between the optic canals 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