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I suggest merging the intramedullary article into the medullary cavity article, leaving behind only a redirect. As far as I can tell, they seem to be the same thing -- it's the location inside a bone where a intramedullary rod can be placed. They seem to be at least similar enough that a single article could cover both of them and also clarify the difference (if any). --220.127.116.11 (talk) 03:01, 25 July 2009 (UTC)
According to this article in Science, and this one in Nature, medullary bone is a special type of bone tissue, found in pregnant female birds and dinosaurs. It serves as a sacrificial source of calcium for egg shells. (The Nature article suggests that it may also have had a non-reproductive role in some dinosaurs.) The term is not synonymous with "medullary cavity", and it should have its own article. I'd write it myself, only I'm not any sort of scientist and don't want to display my ignorance, if I can help it. J. D. Crutchfield | Talk 20:57, 16 March 2016 (UTC)