Paralysis agitans is

The process of myelination in the $C.N.S.$ is carried out by:

What is the full form of $CNS$?

What does the ventral root of the spinal nerve contain?

Arrange the meninges of the brain and spinal cord in the correct order from inside to outside.

Read the following statements carefully and select the correct option:
$I.$ The medulla is connected to the spinal cord.
$II.$ Medulla contains controlling centres for respiration,cardiovascular reflexes and gastric secretion.
$III.$ Cerebellum has a very convoluted surface in order to provide the additional space for more neurons.