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 about dead bone.[1] 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.[2][3]
^Pineda, Carlos; Espinosa, Rolando; Pena, Angelica (May 2009). "Radiographic Imaging in Osteomyelitis: The Role of Plain Radiography, Computed Tomography, Ultrasonography, Magnetic Resonance Imaging, and Scintigraphy". Semin Plast Surg. 23 (2): 080–089. doi:10.1055/s-0029-1214160. PMC 2884903. PMID 20567730.
^"Science Word of the Day: Involucrum". National Geographic. 2015-01-05. Archived from the original on October 30, 2018. Retrieved 29 October 2018.
^Switek, Brian (1 December 2010). "How Did Whales Evolve?". Smithsonian. Retrieved 30 October 2018.
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...
At the same time as this, new bone is forming (known as involucrum). Openings in this involucrum allow debris and exudates (including pus) to pass from...
thickened auditory bulla, otherwise known as an involucrum. This discovery was significant as the involucrum was a morphology thought previously to be exclusive...
around the area of necrosis. The resulting new bone is often called an involucrum. On histologic examination, these areas of necrotic bone are the basis...
a relatively thin lateral wall and thickened medial part known as the involucrum. However, in contrast to later cetaceans, the tympanic bone makes contact...
infection on the first phalanx on the third toe that was afflicted by an involucrum. The infection was long-lived, perhaps up to six months. "Big Al II" is...
and moss, of the common carder bee, Bombus pascuorum. The wax canopy or involucrum has been removed to show winged workers and pupae in irregularly placed...
solitary, long-pedunculated head, with a campanulate to hemispherical involucrum. There are 12 to 16 bracts, the outer ones being pointed. The flowers...
The ectotympanics of all cetaceans, including Ambulocetus, possess an involucrum (thickened lump of bone) at the medial lip. Unlike Pakicetus, but like...
(an involucrum). Sequestra may also be revascularized by new blood vessels, cause no symptoms or become chronically infected. Sometimes the involucrum is...
pakicetids resembles those of modern whales, but the sigmoid process, involucrum, pachyostotic (compact) and rotated ossicles of their ears still reveal...
omnivorous creature shared some traits of modern whales, most notably the involucrum, a bone growth pattern which is the diagnostic characteristic of any cetacean;...
constructing nest structures such as brood cells, food pots, and the protective involucrum. Wax is secreted by young bees through glands located on the top of their...
origine et structura membranarum, quæ in tuberculis capsulisque verminosis involucrum præbent," a prize essay at the University of Berlin, 1859. "Über Blutaustritt...
but constantly build new cells. The brood chamber is surrounded by the involucrum, which is a multilayered envelope. T. hockingsi constructs brood combs...
surface of the nests remained a thin soft layer, but during repair, an involucrum forms in which old architecture is built over using new structures. Workers...
not been found in flowers, unless the brown and black pigments in the involucrum of certain compositae are found to be of the phlobaphene type. In bark...
A prominent keel emerges from the medial margin of the bulla and the involucrum is much steeper towards the front, both features setting the taxon aparat...
margin and resembling an eyelid. The specific epithet comes from the Latin involucrum (a whorl of bracts around flowers or fruit), and gero (bearing or borne...
well-developed involucrum, surrounding a nest consisting of several layers of horizontally arranged combs, and outside the involucrum, which house a number...
of the tympanic slightly inflated; sub-rectilinear medial edge of the involucrum with a step in its anterior third; anterior process of the petrosal sub-triangular;...
nest. This brood chamber is surrounded by layers of cerumen, called the involucrum, which helps maintain a constant climate in the brood chamber. Stingless...
young adults and the queen, (4) nest cleaning, reconstruction of the involucrum, nectar maintenance, and guarding the nest and (5) collection of pollen...
Australiensis. The specific epithet (involucrata) is derived from the Latin word involucrum meaning "wrapper", "case" or "envelope", referring to the persistent bracts...
head of the first phalanx of the third toe also contained a possible involucrum. Multiple pathologies were also observed in five ribs and cervical vertebrae...
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