Peripheral Nervous System Anatomy - Learn Lession

Learn Peripheral Nervous System Anatomy - Learn Lession |


welcome back to our lesson on the nervous system, we introduced the peripheral nervous system or the pns we will talk about the structure of the pns including its major subdivisions in addition we cover how its sensory and motor functions work together.

Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy
Peripheral Nervous System Anatomy

In a cyclical process to create the reflex arc great so let  s begin in the human body there are pairs of nerves that branch from the spinal cord and    pairs that emerge from the brain collectively these      nerve pairs are considered separate from the brain and spinal cord and therefore they form the base structure of the peripheral nervous system the peripheral nervous system is made up of two types of neurons sensory neurons also known as afferent neurons and motor neurons also known as efferent neurons as their name suggests sensory neurons detect various sensations such as pain and heat these neurons transmit messages toward the central nervous system in order to be interpreted by either the spinal cord or by the brain motor neurons do the opposite they transmit messages away from the central nervous system to other areas of the body this is to stimulate effectors such as the skin sense organs or muscles to perform a function or reflex note that all      pairs of nerves in the pns perform either sensory motor or mixed functions this neurological circuit of information that includes sensory detection interpretation of sensory input and a resulting motor output is called the reflex arc as sensory information comes in it passes through ganglia which are collections of sensory neurons soma the ganglia send these signals into the dorsal section of the spine where the information gets processed after the CNS processes this information it gets sent out from the ventral section of the spine via the motor neurons the motor neurons then carry the process response towards the effectors the peripheral nervous system also has two separate divisions based on voluntary and involuntary responses or reflexes voluntary responses are consciously controlled whereas involuntary responses are unconsciously controlled the somatic nervous system is the pns division that controls voluntary responses it is also responsible for relaying sensory and motor information between the outside environment and the CNS this is due to the fact that most somatic nerves innervate outer sections of the body such as the skin and skeletal muscles hence any muscle movement or voluntary motor output uses the somatic nervous system
 the autonomic nervous system is the peripheral nervous system division that handles involuntary movement it generally innervates our internal organs and it controls the vital functions that keep us alive most importantly it controls our heart rate it controls our respiration and it controls our digestion all of these and many other internal processes happen without our conscious control due to the autonomic division lastly there are two subdivisions of the autonomic nervous system the sympathetic nervous system and the parasympathetic nervous system each of these subdivisions perform opposite functions to maintain internal balance the sympathetic nervous system is what is called our fight  or  flight response system that when stimulated causes general alertness and excitement it  s the body  s way of responding to a perceived threat the parasympathetic nervous system is the opposite it  s our body  s rest and digest response system basically this means that a
 parasympathetic response generally restores the body to a calm or restful state this concludes our discussion on the peripheral nervous system thank you.