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.

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