$(a)$ Name the part of the brain which controls:
$(i)$ voluntary actions,
$(ii)$ involuntary actions.
$(b)$ What is the significance of the peripheral nervous system? Name the components of this nervous system and distinguish between the origin of the two.

(N/A) $(i)$ Voluntary actions are controlled by the cerebrum (specifically the motor cortex).
$(ii)$ Involuntary actions (such as blood pressure,salivation,and vomiting) are controlled by the medulla oblongata.
$(b)$ The peripheral nervous system $(PNS)$ facilitates communication between the central nervous system $(CNS)$ and the rest of the body.
The components of the $PNS$ are cranial nerves and spinal nerves.
Distinction in origin:
$1$. Cranial nerves arise directly from the brain.
$2$. Spinal nerves arise from the spinal cord.