reversal line

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reversal line

A cement line seen in microscopic sections of bone that shows scallops and irregularities representing earlier bone resorption. Resorption to that point occurred before the process reversed and new bone was formed by apposition. See: Howship lacuna
See also: line


a turning or change in the opposite direction.

reversal band
band separating the osteoid seam in developing bone from the remaining osteoid tissue.
reversal line
basophilic cement lines in bone that are wavy rather than smooth and are an indication that the previous cellular activity at the site was resorptive. See also resting line.