Nerve

related topics
{disease, patient, cell}
{@card@, make, design}
{acid, form, water}
{math, energy, light}
{line, north, south}

A peripheral nerve, or simply nerve is an enclosed, cable-like bundle of peripheral axons (the long, slender projections of neurons). A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons. Nerves are found only in the peripheral nervous system. In the central nervous system, the analogous structures are known as tracts.[1][2] Neurons are sometimes called nerve cells, though this term is potentially misleading since many neurons do not form nerves, and nerves also include non-neuronal Schwann cells that coat the axons in myelin.

Each nerve is a cordlike structure that contains many axons. These axons are often referred to as “fibres”. Within a nerve, each axon is surrounded by a layer of connective tissue called the endoneurium. The axons are bundled together into groups called fascicles, and each fascicle is wrapped in a layer of connective tissue called the perineurium. Finally, the entire nerve is wrapped in a layer of connective tissue called the epineurium.

Contents

Anatomy

Nerves are categorized into three groups based on the direction that signals are conducted:

Nerves can be categorized into two groups based on where they connect to the central nervous system:

Full article ▸

related documents
Cerebral arteriovenous malformation
Dendritic cell
Goitre
Meconium aspiration syndrome
Peritoneum
Catatonia
Q fever
Ciclosporin
Tumor suppressor gene
Lambert-Eaton myasthenic syndrome
Tylenol
Seasonal affective disorder
Leprosy
Gynaecology
Artificial respiration
Diabetic ketoacidosis
Laudanum
Obstetrics
Rickets
Pelizaeus-Merzbacher disease
Circulatory system
Progressive multifocal leukoencephalopathy
Endorphin
Exocrine gland
Cerebral cortex
Paralysis
Breast reconstruction
Gastrointestinal tract
Spasticity
Pediatrics