Nervous system.Definition and function

Human Nervous System

The nervous system, which plays a crucial role in the regulation of the body, is a complex network of organs, tissues, and cells. They work together to control and coordinate various bodily functions


This article provides an overview of the nervous system (cns ), with a focus on its structure and function.

The Central Nervous System (cns ),


ALSO the central nervous system, composed of the brain and spinal cord, is responsible for receiving and processing sensory information from the body and generating appropriate responses.

We find that the skull protects the brain, and the vertebral column houses the spinal cord. We can divide the central nervous system into two parts:

The Brain

The brain, the most complex organ in the body, is responsible for receiving and processing information from the body’s senses and generating appropriate responses.

Different regions compose it, and each part has a specific function, such as movement, sensation, emotion, and cognition.

The Spinal Cord

The spinal cord is a long, thin, tubular bundle of nerve fibers. It extends from the brainstem to the lumbar region of the vertebral column.

And we see the spinal cord plays a crucial role in coordinating incoming information and reworking the appropriate responses.

The Peripheral Nervous System

The peripheral nervous system consists of the nerves and ganglia. They extend from the brain and spinal cord to the rest of the body. We can divide the PNS into two parts:

The Nerves

The long nerve fibers called nerves transmit nerve impulses from the sense organs to the central nervous system, which processes the impulses before sending them to the muscles and glands.

The Ganglia

Some nerve cells form small clusters known as ganglia, and these ganglia have a role in processing sensory information and regulating bodily functions.

The peripheral nervous system can also be divided into two parts:

The Autonomic Nervous System

The autonomic NS regulates the body’s involuntary functions, such as heart rate, digestion, and breathing.

The Somatic Nervous System

The somatic NS is responsible for controlling the body’s voluntary movements, such as walking and talking.

 The Endocrine System

The endocrine system, which consists of a network of glands that produce and secrete hormones, supports the NS in regulating bodily functions.

Nerve Cells and Glial Support Cells

The organs of the NS are composed of two types of cells: nerve cells (neurons) and glial support cells. Neurons are specialized cells that are capable of receiving and transmitting electrical signals to other nerve cells.

In addition, they consist of a large cell body containing the nucleus and cell organelles. Two types of appendages arise from the cell body: dendrites, which are short, highly branched extensions that receive signals from other neurons, and axons, which are long, thick fibers that transmit signals to other neurons.

Glial support cells, on the other hand, protect, insulate, and sustain neurons. They are of various types, including Schwann cells, which coil around the axons of neurons in the PNS, forming the myelin sheath, a thick substance that protects and nourishes the neuron.


We summarize the topic the nervous system (cns ), is a complex network of organs, tissues, and cells that work together to control and coordinate various bodily functions.

Understanding its structure and function is crucial in diagnosing and treating neurological disorders. With its central and peripheral divisions, as well as the supporting endocrine system, it regulates the body’s responses to stimuli, both internal and external.

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il sistema nervoso


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