Question

Write short note on forebrain.

Answer 1

The brain is divided into three major parts known as forebrain, midbrain and hindbrain.

(i) Cerebrum:

The cerebrum is the largest part of the brain. It is divided into two cerebral hemispheres joined by the corpus callosum. The cerebral hemispheres are covered by a layer of cells known as cerebral cortex or grey matter. The innermost part of cerebrum gives an opaque white appearance to the layer and is known as the white matter. It helps to interpret the received stimulus from the effector organ.

(ii) Thalamus:

The thalamus is the main centre of coordination for sensory and motor signalling. It is wrapped by the cerebrum.

(iii) Hypothalamus:

It lies at the base of the thalamus and contains a number of centres that regulate body temperature and the urge for eating and drinking. Some regions of the cerebrum, along with hypothalamus, are involved in the regulation of sexual behaviour and expression of emotional reactions such as excitement, pleasure, fear, etc.