The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of the nerve fibers that branch off from the spinal cord and extend to all parts of the body, including the neck and arms, torso, legs, skeletal muscles and internal organs.
Then, what makes up a nerve?
Nerves are cells called neurones, which make up our nervous system. Nerves are specialised cells - they carry messages from one part of the body to another, as tiny electrical signals. These messages are also known as nerve impulses. Together, the spinal cord and brain make up the central nervous system.
What is a nerve consist of?
A nerve cell (neuron) consists of a large cell body and nerve fibers—one elongated extension (axon) for sending impulses and usually many branches (dendrites) for receiving impulses. Each large axon is surrounded by oligodendrocytes in the brain and spinal cord and by Schwann cells in the peripheral nervous system.
What is inside the nerve?
A nerve is an enclosed, cable-like bundle of axons (nerve fibers, the long and slender projections of neurons) in the peripheral nervous system. A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons to peripheral organs.