The term anterior part of the brainstem refers to the anterior part of the brainstem divided longitudinally. It includes the cerebral crus, the anterior part of the pons, and the pyramid of the medulla. The other parts of the brainstem so divided are the brainstem tegmentum, the ventricular system of the brainstem, and the Tectum (Schiebler) ( Schiebler-1999 ).