Describe briefly the types of neural system in humans.

(N/A) The human neural system is divided into two main parts:
$(i)$ The Central Neural System $(CNS)$
$(ii)$ The Peripheral Neural System $(PNS)$
$(1)$ The $CNS$ includes the brain and the spinal cord. It is the site of information processing and control.
$(2)$ The $PNS$ comprises all the nerves of the body associated with the $CNS$ (brain and spinal cord). The nerve fibres of the $PNS$ are of two types:
$(a)$ Afferent nerve fibres: These transmit impulses from tissues/organs to the $CNS$.
$(b)$ Efferent nerve fibres: These transmit regulatory impulses from the $CNS$ to the peripheral tissues/organs.
The $PNS$ is further divided into two subdivisions:
$(i)$ Somatic Neural System: This relays impulses from the $CNS$ to skeletal muscles.
$(ii)$ Autonomic Neural System: This transmits impulses from the $CNS$ to involuntary organs and smooth muscles of the body. The autonomic neural system is further classified into the Sympathetic Neural System and the Parasympathetic Neural System.
Additionally,the Visceral Nervous System is a part of the peripheral nervous system that comprises the whole complex of nerves,fibres,ganglia,and plexuses by which impulses travel from the $CNS$ to the viscera and from the viscera to the $CNS$.