The peripheral nervous system (PNS) is a system of connections that allows the brain and spinal cord to communicate with the rest of the body. It consists of two types of nerves: Spinal nerves: these nerves, which run from the spinal cord to muscles and other parts of the body,
carry out the bidirectional transmission of neural signals. Cranial nerves: These nerves are involved in muscular and sensory processes in the head and neck. In addition to these two categories of nerves, the SNP includes a subsystem of the overall nervous system: the “autonomic nervous system” (ANS).
The ANS regulates glands and two types of muscles (smooth and cardiac). It is involved in automatic or involuntary actions, such as reflex muscle contractions and dilation of the pupils. The ANS is divided into two parts: The sympathetic nervous system: the sympathetic branch of the ANS is involved in the energetic activation of the body when it requires an energy input. For example,
if you find yourself in a dangerous situation, your sympathetic nervous system (SNS) is triggered and gives you the energy you need to meet the challenge or escape. Parasympathetic Nervous System: The parasympathetic branch of the SNS disables the SNS when it is no longer needed. This is sometimes referred to as a “relaxation response” because the SNS activity is slowed down or put on standby so that the individual can return to normal functioning ;