A Rear View Of The Median Sulcus Of The Rhomboid Fossa Of The Brainstem

Description

Arising along the midline of the rhomboid fossa, the median sulcus runs vertically on the dorsal surface of the pons and open medulla, dividing the floor of the fourth ventricle into right and left halves. A posterior (dorsal) brainstem view keeps the ventricular cavity anterior to the viewer while the sulcus remains the central landmark, bordered on each side by the medial eminence and more laterally by the sulcus limitans. As the camera tracks inferiorly, the sulcus is followed toward the obex at the caudal apex of the fourth ventricle, where the ventricular floor narrows and transitions toward the central canal. Orientation is explicit. Teaching the floor of the fourth ventricle without motion often leaves learners uncertain about where the pons ends and the medulla begins, and how the surface landmarks align with the underlying cranial nerve nuclei. By moving along the sulcus in sequence, the animation reinforces midline symmetry and helps anchor adjacent features used in neuroanatomy and neurosurgery, including the facial colliculus region (overlying the abducens nucleus and internal genu of the facial nerve) and the striae medullares crossing the ventricular floor. That spatial logic matters when localizing dorsal pontine and medullary lesions on MRI, where symptoms such as abducens palsy, facial weakness, or internuclear ophthalmoplegia are interpreted against these dorsal brainstem relationships. Neuroanatomy courses and board-style teaching modules can use this clip to introduce rhomboid fossa topography before adding cranial nerve nuclei, vascular territories, or dorsal brainstem syndromes. It also suits figure support for neurology and neurosurgery texts discussing fourth ventricular approaches, including safe entry zones that reference the median sulcus and sulcus limitans. Anatomical accuracy verified by SciePro's Medical Advisory Board.