Category: N

A drug that dilates blood vessels. It is similar to nicotinic acid and is used to treat disorders due to poor circulation, such as chilblains and Raynaud’s disease. It is administered by mouth; side-effects are rare, but temporary flushing of the face may occur.  

A drug with effects similar to phenelzine, used to treat all types of depression. It is administered by mouth; headache, nausea, dizziness, and giddiness are common side-effects.  

Combined inflammation of the optic nerve and the retina.  

Nerve tissue that is visible microscopically as a mass of interwoven and interconnected nerve endings, dendrites, and other neuron components, rather than an ordered array of axons. The gray matter of the CNS, a network of neurons, neuroglia, and their cell processes resembling intermingled fibers of felt.  

Reconstructive surgery for damaged or severed peripheral nerves.  

The process whereby damaged or degenerating nerve cells finally disintegrate and are removed by scavenger cells (phagocytes).  

The predisposition of a nerve cell to move toward the source of its stimuli during development.  

The spinous process situated on the neural arch of a vertebra.  

An allergic skin reaction causing blisters and wheals, resembling those caused by nettle stings.  

The long fine process that extends from the cell body of a neuron and carries nerve impulses. Bundles of nerve fibers running together form a nerve. Each fiber has a sheath, which in medullated nerve fibers is a relatively thick layer containing the fatty insulating material myelin.