A nerve is a cable-like collection of peripheral axons (the long slender, projections of the neurons) that are enclosed within a dense casing of connective tissue (this tissue is known as epineurium).

Some facts about nerves, they:

• Are only ever located in the peripheral nervous system
• Provide a route for electrochemical nerve impulses to travel along
• Convey information in the form of electrochemical impulses (commonly referred to as nerve impulses). These impulses originate from the individual neurons that constitute the nerve.
• Relay information through their impulses at an extremely rapid rate, often up to speeds of 120 m/s 
• Can be damaged by physical injury, autoimmune diseases, infection, swelling or failure of surrounding blood vessels
• Cause discomfort, pain, numbness, weakness and even paralysis when they are damaged

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