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The midbrain bears two imperfectly divided optic lobes. A membrane, choroid plexus lies between the optic lobes. It is fused with the plexus over the fourth ventricle, the cavity of the medulla oblongata. Mesencephalon is concerned with sight.RhombencephalonIt is divisible into an anterior meten-cephalon (cerebellum) and a posterior my-elencephalon (medulla oblongata). The cerebellum is small and occurs as a transverse band roofing over the anterior end of the fourth ventricle. The medulla oblongata is largest and highly developed. It controls the powerful sucking structures through trigeminal nerve.Cavities of the brainThe cavities of the brain are ventricles and that of the spinal cord is central canal (p. 114).Spinal cordThe spinal cord is tubular, of fairly uniform diameter throughout its length, tapering gradually towards the posterior, and encloses the central canal. It is flattened, convex dorsally and concave ventrally. Grey matter is in the form of a longitudinal band surrounded by white matter, the two not sharply differentiated