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N: Glossary

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Nerve root: The end of a spinal nerve nearest its attachment to the spinal cord.

Neuralgia: A paroxysmal pain extending along the course of one or more nerves.

Neurectomy: Excision of part of a nerve.

Neuritis: Inflammation of a nerve. May also be used to denote non-inflammatory nerve lesions of the peripheral nervous system.

Neuroblastoma: A tumor of sympathetic nervous system origin, found mostly in infants and children.

Neurofibroma: A tumor of the peripheral nerves due to an abnormal collection of fibrous and insulating cells.

Neurofibromatosis: A familial condition characterized by developmental changes in the nervous system, muscles, and skin, marked by numerous tumors affecting these organ systems. More about neurofibromatosis.

Neurolysis: Removal of scar or reactive tissue from a nerve or nerve root.

Neuroma: A tumor or new growth largely made up of nerve fibers and connective tissue.

Neuropathy: Any functional or pathologic disturbance in the peripheral nervous system. Disorder may be localized secondary to lesion or generalized secondary to medical disorder.

Nucleus: The soft center of a spinal disc.

Nystagmus: Involuntary rapid movement of the eyes in the horizontal, vertical, or rotary planes of the eyeball.