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Periosteal Bone

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Periosteal Bone 

in vetebrates, a bone that originates without undergoing a cartilaginous stage. An aggregate of cells of skeletogenous mesenchyme form osteoblasts and then a bone. In the process of vertebrate evolution, most periosteal bones were formed from cutaneous scales embedded in the skin. Examples include the frontal and temporal bones (seeSUBSTITUTION BONE). [20–487–l]



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The pattern is believed to represent either an acceleration of the normal periosteal bone response or alternating periods of rapid and slow growth.
By 26 weeks, ossification has progressed, and growth of the outer layer of periosteal bone has resulted in a partial closure of the sulcus, forming the fallopian canal.
Seven weeks after OVX, there were increases in the periosteal perimeter, cortical area, and periosteal bone formation indices, indicating that ovariectomy increased modeling-dependent bo ne on the periosteal envelope, relative to controls.
 
 
 
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