Nervous System: What are the Differences Between a CNS & a PNS?

    What is the Differences Between a CNS & a PNS?

    The human nervous system is a complex neuron and related cell connection system. The nervous system helps one to dream, to respire, and to feel. Scientists split the nervous system into two major parts: the CNS and the peripheral nervous system (PNS). These portions of the nervous system vary in their anatomical mechanisms and functions.

    Comparison between CNS & PNS

    Nervous System: What are the Differences Between a CNS & a PNS?

    Structures of base

    The CNS contains the brain and spinal cord, while the PNS consists of all other tissues of the nervous system. The PNS contains both feedback receptors, sensory nerves, and motor neurons. The skull and spinal vertebrae bones embrace all nerves of the CNS.

    PNS neurons are not enclosed in the bone; they move through the muscle, organ, and skin tissue, and sit on them. Neuron groups form both in the CNS and in the PNS. A community of neurons is referred to as a nucleus in the CNS. A group of cell bodies is called a ganglion in the PNS, whereas a group of neuronal tracts is called a nerve.


    The main goal of the CNS is the arrangement and interpretation of knowledge. The nervous system impulses pass through the spinal cord to and from the cortex. Various sensory and motor information areas of the brain process help us to observe and respond to our surroundings.

    The key goal of the PNS is to execute the CNS instructions. In the PNS neurons accumulate sensory input and relay it to the CNS. After the CNS processes information, by adjusting the motor output, the PNS responds to its commands.


    The brain and spinal cord are separated into general goals. The cortex, for example, comprises the brain, diencephalon, midbrain, and hindbrain. Each area of the brain executes a certain number of activities.

    The PNS is classified into the somatic and autonomous nervous systems. The somatic nervous system consists of the sensory input and motor orders actively regulated nerves. The autonomous nervous system functions without conscious brain commands. It controls cardiac rhythms, bowel function, breathing, salivation, and sexual excitement.


    Experts divide the essential functions of the nervous system into the CNS and PNS. Both aspects of the nervous system, though, function together and are vital to survival. Without the PNS, the CNS will have no sensory feedback, making responding to the environment difficult.

    The PNS is still dependent on the CNS to organize input from various parts of the body and determine how you should respond to this situation. These two elements of the nervous system synchronize our conscious experience of daily life.

    Rajat Singh
    A Bioinformatics Masters degree from the G.N Khalsa Science and Commerce College (Mumbai). Blogger by choice and an enthusiastic person with a technical background and passion.

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