3D Models Related Images

Anterior View of Dissected Brainstem

Surgical Correlation


Anterior View of Dissected Brainstem. The corticospinal tract descends in sequence through the cerebral peduncle, basis pons, and medullary pyramid.  At the medulla-spinal cord junction, the fibers undergo a partial decussation (pyramidal decussation), with the majority of fibers crossing over to form the spinal cord lateral corticospinal tract.  The vestibulocochlear nerve exits the brainstem laterally at the ponto-medullary junction. Medial to the vestibulocochlear nerve, the facial nerve exits the brainstem. Further medially still, the abducens nerve exits at the ponto-medullary junction. (Image courtesy of M Nunez)