Sphingomyelin (SPH, ˌsfɪŋɡoˈmaɪəlɪn) is a type of sphingolipid found in animal cell membranes, especially in the membranous myelin sheath that surrounds some nerve cell axons. It usually consists of phosphocholine and ceramide, or a phosphoethanolamine head group; therefore, sphingomyelins can also be classified as sphingophospholipids. In...
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http://en.wikipedia.org/wiki/Sphingomyelin
(from the article `sphingolipid`) Sphingomyelins, which are the only phosphorus-containing sphingolipids, are most abundant in nervous tissue, but they also occur in the blood. In bilayers many glycerophospholipids as well as sphingomyelin (discussed below) can be in either one of two states, gel or liquid-crystalline. In ... ...to that...
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http://www.britannica.com/eb/a-z/s/140
<biochemistry> A sphingolipid in which the head group is phosphoryl choline. A close analogue of phosphatidylcholine. In many cells the concentration of sphingomyelin and phosphatidylcholine in the plasma membrane seems to bear a reciprocal relationship. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
(sfing″go-mi´ә-lin) a group of phospholipids that on hydrolysis yield phosphoric acid, choline, sphingosine, and a fatty acid.
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http://www.encyclo.co.uk/local/21001
A sphingolipid in which the head group is phosphoryl choline. A close analogue of phosphatidyl choline. In many cells the concentration of sphingomyelin and phosphatidyl choline in the plasma membrane seems to bear a reciprocal relationship.
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