Forebrain is the main thinking part of the brain. It consists of cerebrum, thalamus, and hypothalamus.

(i) Cerebrum:

Cerebrum is the largest part of the brain. It is divided into two cerebral hemispheres which are joined corpus callosum. The cerebral hemispheres are covered by a layer of cells known as cerebral cortex or grey matter. Cerebrum has sensory regions known as association areas. The innermost part of cerebrum gives an opaque white appearance to the layer and is known as the white matter.

(ii) Thalamus:

Thalamus is the main centre of coordination for sensory and motor signalling. I

(iii) Hypothalamus:

It lies at the base of thalamus and contains a number of centres that regulate body temperature and the urge for eating and drinking.