Sphenoidal Yoke Of The Sphenoid Bone, Anatomy

Description

Jugum sphenoidale spans the midline on the superior surface of the sphenoid body, forming the smooth bony yoke between the right and left lesser wings. In this fixed superior cranial base perspective, the surface lies anterior to the sulcus chiasmatis (prechiasmatic groove) and anterior to the sella turcica, while the medial margins of the lesser wings frame it laterally near the entrances to the optic canals. The anterior sphenoidal crest rises at the midline toward the frontonasal region, and the planum-like contour of the jugum transitions posteriorly into the chiasmatic sulcus. Flat and thin. This region matters because it is a key landmark of the anterior skull base and suprasellar corridor, where millimeters separate bone from the optic nerves and optic chiasm. Planum sphenoidale and tuberculum sellae meningiomas often abut or originate near this surface, and traumatic fractures through the jugum can contribute to anterior cranial fossa CSF rhinorrhea by violating adjacent dura along the sphenoid body. The lighting and smooth surfacing in the illustration help you read the subtle change from the jugum sphenoidale into the chiasmatic sulcus and recognize how the lesser wings bracket this area before the skull base drops into the hypophyseal fossa. Use this illustration in gross anatomy and neuroanatomy teaching when introducing the central skull base, and in neurosurgical or ENT publications discussing endoscopic endonasal approaches to the planum sphenoidale or tuberculum sellae where bony landmarks guide safe dural opening. It also supports radiology correlation for axial and coronal CT anatomy of the anterior cranial fossa floor and sphenoid body. Anatomical accuracy verified by SciePro's Medical Advisory Board.