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The third to appear has a ventral convexity and is known as the pontine, since it marks the site of the future pons Varolii; it resembles the permanent flexure in the reptilian brain.

Above the medulla we observe the pons Varolii, just above which we observe the fibres ascending to each hemisphere under the name of crus cerebri, or thigh of the cerebrum.

The medulla oblongata is the prolongation of the spinal cord, extending to the pons Varolii.

Here is the "island of Reil," here the "pons Varolii"; here is the "arbor vitæ"; and here is the "subarachnoid space"; and here that wonderful contrivance of the great Designer that regulates the arterial supplies.

The Pons, or pons Varolii, named from its supposed resemblance to a bridge, is situated in front of the cerebellum, and is readily recognized as a circular expansion which extends forward from that body.