The basilar part of pons, also known as basis pontis, is the ventral part of the pons; the dorsal part is known as the pontine tegmentum. The basilar pons makes up two thirds of the pons within the brainstem. It has a ridged appearance with a shallow groove at the midline This groove is called the basilar sulcus and is covered by the basilar artery, which feeds into the Circle of Willis and provides blood supply to the brainstem and cerebellum. The basilar pons has this kind of appearance due to the fibers that come out of the pons and enter the cerebellum. This part of the brainstem contains fibers from the corticospinal tract (a descending pathway for neurons to reach other structures in the body), pontine nuclei, and transverse pontine fibers. The corticospinal tract carries neurons fro