pons

[L. bridge.] i. Pons Varolii, a prominent white ma on the basal aspect of the brain, lying in front of the cerebellum inferiorly, between the medulla and the cerebral peduncles, from each of which it is marked off by a groove; it is convex from side to side anteriorly, and posteriorly it forms part of the floor of the fourth ventricle, a. bridge-like formation connecting two more