PNS is composed of neurons that are connected to the brain.

The PNS is located distinctly outside the Central nervous system.

The Central nervous system consists of the brain and spinal cords.

The function of the PNS is to allow the central nervous system to connect with the limbs and organs.

The PNS is not protected by bone or a blood-bone barrier. This is contraire to the CNS which has both barriers.

The PNS is divided into two categories

1.) Somatic Nervous System
2.) Autonomic Nervous System

The somatic nervous system has a function of body movement control and receiving stimulation for an external source.

Autonomic Nervous system is divided into 3 divisions

1.) Sympathetic Division
2.) Parasympathetic Division
3.) Enteric Division

Sympathetic division - this is responsible for stimulation when danger and/or stress is present causing an increase in blood pressure, heart rate, excitement, and other physiological changes. This is an increase in adrenaline

Parasympathetic division - this is responsible for stimulation when no danger or stress is present but rather simplistic or relaxation is occurring. This causes a slowing heart rate, digestion, and other physiological changes. This is when no adrenaline is required.

Enteric division – this is responsible for management of the digestion system from the oral cavity to the through the small intestines.