Explain What Is Meant By Mid-brain And Hind-brain?

This question relates to the topic of the nervous system of a mammal. The mid-brain consists of the optic lobes which are represented in mammals by four small bodies called corpora quadrigemina. These are concerned with visual reflexes e.g. movement of the eyeballs.

Coming to hind-brain, the cerebellum lies dorsally behind the optic lobes. It is large, and its surface is thrown into many folds. The cerebellum plays an important part in controlling muscular co-ordination, and especially in maintaining body balance.
The medulla oblongata lies below the cerebellum. Its latter or lower end narrows down gradually into the spinal cord. The medulla oblongata controls involuntary actions such as the heartbeat, peristalsis, the rate of respiratory movements and the contraction and the dilation of blood vessels.

A short canal leads from the third ventricle to the fourth ventricle in the medulla. This communicates posteriorly with the central canal of the spinal cord. All the ventricles are filled with cerebo spinal fluid, a colorless, cell free fluid. It is derived from blood by diffusion through the thin roofs of the third and fourth ventricles, each of which is richly supplied with blood vessels. The cerebo spinal fluid brings nutrients to the brain