Question

Pallium is
A)Lateral walls of diencephalon
B)Lateral walls of cerebrum
C)Floor walls of paracoel
D)Roof of paracoel

Answer 1

Hint: The brain is meant to be one of the largest and most important and complex structures. It plays several vital roles such as processing of information, nervous and motor responses etc. The brain is categorised into three important parts which are named as the cerebrum, the cerebellum and the brain stem.

Complete answer:
The brain and the spinal cord constitute the central nervous system. During the process of development in living organisms, the brain can be categorised into three parts. The three parts are named as the forebrain or the prosencephalon, midbrain or the mesencephalon and the hindbrain or the rhombencephalon. Each part of the brain produces different parts such as the cerebrum, cerebellum and the brain stem.

The cerebrum is the most developed portion of the brain and it is made up of the major lobes. It is also termed as the telencephalon. It is composed of the cerebral cortex and other areas such as the basal ganglia, hippocampus and olfactory lobes. The cerebrum is produced from the prosencephalon. The cerebellum is the part of the hindbrain and is located near the brain stem.

On the dorsal part of the cerebral hemisphere, the grey matter is transformed into a thicker layer and it is termed as the pallium. The pallium encloses the roof of the paracoel. The paracoel is also termed as the lateral ventricles. The pallium is the part of the telencephalon and in mammals, it gets transformed into the cerebral cortex.
It makes the roof of the second cavity or the ventricle and is present in the cerebral cortex.

Hence, the correct answer is option (D)

Note: The paracoel is also termed as the second ventricle. The medial part of the pallium produces the hippocampus. The lateral and ventral pallium produces the olfactory cortex, bulbs and the pallial part of the amygdala.
The pallium gets the primary sensory afferent through olfactory receptors and is responsible for the voluntary movements.