A drug that induces stupor and insensibility and relieves pain.

A malignant tumour of the kidney found in children.

Any of the nerve cells of the embryo that give rise to functional nerve cells (neurones).

A malignant tumour composed of embryonic nerve cells.  It may originate in any part of the sympathetic nervous system, most commonly in the medulla of adrenal gland, and secondary growths are often widespread in other organs and in bones.

A benign tumour growing from the fibrous coverings of a peripheral nerve: it is usually symptomless.  When it develops from the sheath of a nerve root, it causes pain and may compress the spinal cord.

A congenital disease that is typified by numerous benign tumours growing from the fibrous coverings of nerves.

See glia -

One of the basic functional units of the nervous system: a cell specialised to transmit electrical nerve impulses and so carry information from one part of the body to another. 

A variety of granulocyte (a type of white blood cell) distinguished by a lobed nucleus and the presence in its cytoplasm of fine granules that stain purple with Romanowsky stains.  It is capable of ingesting and killing bacteria and provides an important defence against infection.

Any one of a large group of drugs used for pain relief, particularly in rheumatic disease.