Which of the following nerves can inhibit the heartbeat?

The human hindbrain comprises three parts, one of which is

$A$ touch on the right hand stimulates neurons in which part of the brain?

The cytons of reflex in the central nervous system and autonomic nervous system are:

Which of the following statements are correct about the cortex of the cerebrum? Choose the correct codes given below:
$(I)$. It consists of grey matter.
$(II)$. It shows prominent folds.
$(III)$. It consists of white matter.
$(IV)$. It contains motor areas,sensory areas,and association areas.

The third ventricle is present in: