Involucrum

{{Distinguish|Involucre}} An '''involucrum''' (plural '''involucra''') is a layer of new bone growth outside existing bone.

There are two main contexts: * In pyogenic osteomyelitis where it is a layer of living bone that has formed around dead bone.<ref>{{cite journal |title=Radiographic Imaging in Osteomyelitis: The Role of Plain Radiography, Computed Tomography, Ultrasonography, Magnetic Resonance Imaging, and Scintigraphy |journal=Semin Plast Surg |volume=23 |issue=2 |pages=080–089 |date=May 2009 |doi=10.1055/s-0029-1214160 |pmid=20567730 |pmc=2884903 |last1=Pineda |first1=Carlos |last2=Espinosa |first2=Rolando |last3=Pena |first3=Angelica }}</ref> It can be identified by radiographically (i.e., with x-rays). * In cetaceans such as whales, it is a thick covering of bone over the middle-ear space.<ref>{{cite web |title=Science Word of the Day: Involucrum |url=https://www.nationalgeographic.com/science/phenomena/2015/01/05/science-word-of-the-day-involucrum/ |archive-url=https://web.archive.org/web/20181030035508/https://www.nationalgeographic.com/science/phenomena/2015/01/05/science-word-of-the-day-involucrum/ |url-status=dead |archive-date=October 30, 2018 |publisher=National Geographic |access-date=29 October 2018|date=2015-01-05 }}</ref><ref>{{cite journal |last1=Switek |first1=Brian |title=How Did Whales Evolve? |journal=Smithsonian |date=1 December 2010 |url=https://www.smithsonianmag.com/science-nature/how-did-whales-evolve-73276956/ |access-date=30 October 2018}}</ref>

==See also== *Sequestrum

==References== {{reflist}}

Category:Bones