| Schwann cell | A specialised glial cell that wraps around vertebrate axons providing extremely good electrical insulation. Separated by nodes of Ranvier about once every millimetre, at which the axon surface is exposed to the environment. See: saltatory conduction, myelin. (18 Nov 1997) |
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| Schwann cell unit | A single Schwann cell and all of the axons lying in troughs indenting its surface; this unit regarded as an unmyelinated fibre in the peripheral nervous system. (05 Mar 2000) |
| schwann cells | Neuroglial cells of the peripheral nervous system which form the insulating myelin sheaths of peripheral axons. (12 Dec 1998) |
| schwann's white substance | <anatomy> The substance of the medullary sheath. Source: Websters Dictionary (01 Mar 1998) |
| Schwann, Theodor | <person> Taught Anatomy and Physiology in Berlin, became Professor of Anatomy in Louvain and was later Professor of Comparative Anatomy and Physiology at Liege. Was an early advocate (1838) of the cellular doctrine of tissues and the originator of the neuronal theory of the nervous system. Schwann cell - produces myelin in the peripheral nervous system. Mikroskopische Untersuchungen ueber die Uebereinstimmung in der Struktur und dem Wachstum der Thiere und Pflanzen. Berlin. 1839. Lived: 1810-1882. B. Neuss, Prussia, Dec 7th, 1810, d. Cologne, Jan 11th, 1882. (05 Dec 1998) |
| sheath of Schwann | <anatomy> The delicate outer sheath of a nerve fibre; the primitive sheath. The perineurium. Origin: NL, from gr. Nerve + peel, skin. Source: Websters Dictionary (01 Mar 1998) |
| T-cell-rich, B-cell lymphoma | <tumour> A B-cell lymphoma in which more than 90% of the cells are of T-cell origin, masking the large cells that form the neoplastic B-cell component. See: adult T-cell lymphoma. (05 Mar 2000) |
| absorption cell | A small glass chamber with parallel sides, in which absorption spectra of solutions can be obtained. (05 Mar 2000) |
| acid cell | One of the cell's of the gastric glands; it lies upon the basement membrane, covered by the chief cell's, and secretes hydrochloric acid that reaches the lumen of the gland through fine intracellular and intercellular canals (canaliculi). Synonym: acid cell, oxyntic cell. (05 Mar 2000) |
| acidophil cell | A cell whose cytoplasm or its granules stain with acid dyes. (05 Mar 2000) |
| acinar cell | Any secreting cell lining an acinus, especially applied to the cell's of the pancreas that furnish pancreatic juice and enzymes to distinguish them from the cell's of ducts and the islets of Langerhans. Synonym: acinous cell. (05 Mar 2000) |
| acinar cell tumour | A solid and cystic tumour of the pancreas, occurring in young women; tumour cells contain zymogen granules. (05 Mar 2000) |
| acinic cell adenocarcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| acinic cell carcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| acinous cell | Any secreting cell lining an acinus, especially applied to the cell's of the pancreas that furnish pancreatic juice and enzymes to distinguish them from the cell's of ducts and the islets of Langerhans. Synonym: acinous cell. (05 Mar 2000) |