Difference Between Central Nervous System And Peripheral Nervous System Pdf

difference between central nervous system and peripheral nervous system pdf

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Spinal Cord Injury Model System.

The human nervous system is a complicated system of connecting neurons and associated cells. The nervous system allows us to think, breathe and feel. Scientists categorize the nervous system into two main parts: the central nervous system CNS and the peripheral nervous system PNS. These parts of the nervous system differ in their structures and physiological functions.

Chapter 3: The nervous system

Although terminology seems to indicate otherwise, there is really only one nervous system in the body. Although each subdivision of the system is also called a "nervous system," all of these smaller systems belong to the single, highly integrated nervous system. Each subdivision has structural and functional characteristics that distinguish it from the others. The nervous system as a whole is divided into two subdivisions: the central nervous system CNS and the peripheral nervous system PNS. The brain and spinal cord are the organs of the central nervous system. Because they are so vitally important, the brain and spinal cord, located in the dorsal body cavity , are encased in bone for protection. The brain is in the cranial vault, and the spinal cord is in the vertebral canal of the vertebral column.

The nervous system comprises the central nervous system, consisting of the brain and spinal cord, and the peripheral nervous system, consisting of the cranial, spinal, and peripheral nerves, together with their motor and sensory endings. The central nervous system is composed of millions of nerve and glial cells, together with blood vessels and a little connective tissue. The nerve cells, or neurons, are characterized by many processes and are specialized for reception and transmission of signals. The glial cells, termed neuroglia, are characterized by short processes that have special relationships to neurons, blood vessels, and connective tissue. The brain is the enlarged, head end of the central nervous system; it occupies the cranium, or brain case. The term cerebrum L. Encephalon, of Greek origin, is found in such terms as encephalitis, which means inflammation of the brain.

The peripheral nervous system consists of the nerves that branch out from the brain and spinal cord. These nerves form the communication network between the CNS and the body parts. The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system. The somatic nervous system consists of nerves that go to the skin and muscles and is involved in conscious activities. The autonomic nervous system consists of nerves that connect the CNS to the visceral organs such as the heart , stomach , and intestines. It mediates unconscious activities. A connective tissue sheath called the epineurium surrounds each nerve.

The Peripheral Nervous System

What exactly is the peripheral nervous system and what role does it play in the body? First, it is important to realize that the nervous system is divided into two parts: the central nervous system and the peripheral nervous system. The central nervous system includes the brain and spinal cord, while the peripheral nervous system includes all of the nerves that branch out from the brain and spinal cord and extend to other parts of the body including muscles and organs. Each part of the system plays a vital role in how information is communicated throughout the body. The peripheral nervous system PNS is the division of the nervous system containing all the nerves that lie outside of the central nervous system CNS.


The former consists of the brain and spinal cord, while the latter is the rest of the nervous system. The brain and spinal cord carry out the bulk of the complex processing, while the peripheral acts as a sort of buffer between the central nervous system and the outside world.


What Are the Differences Between a CNS & a PNS?

The nervous system has three main functions: sensory input, integration of data and motor output. Sensory input is when the body gathers information or data, by way of neurons, glia and synapses. The nervous system is composed of excitable nerve cells neurons and synapses that form between the neurons and connect them to centers throughout the body or to other neurons.

Neuroanatomy : the structure of the nervous system. To learn how the nervous system functions, you must learn how the nervous system is put together. The nervous system can be divided into several connected systems that function together. Let's start with a simple division:. The nervous system is divided into the central nervous system and peripheral nervous system.

The nervous system transmits signals between the brain and the rest of the body, including internal organs. The human brain contains about billion neurons. Bundles of axons, called nerves, are found throughout the body. Axons and dendrites allow neurons to communicate, even across long distances. Different types of neurons control or perform different activities.

Organization of the Nervous System

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