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prechiasmatic sulcus --> chiasmatic groove

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: sulcus prechiasmatis, chiasmatic sulcus, optic groove, prechiasmatic sulcus.