prechiasmatic sulcus

pre·chi·as·mat·ic sul·cus

[TA] 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