Abstract
The intermittent administration of cortisone in both the young and the mature rabbit is associated with appositional bone growth on the periosteal surfaces of the cranium, premaxilla and middle of the shaft of the femur; each new layer of bone is separated from the next by a darkly haematoxylin-staining "reversal" line. The internal architecture of the bone also changes in consequence of the repeated waves of resorption and deposition of bone round vascular spaces.
Cartilaginous growth at the epiphysis in the young rabbit is also affected. The long columns of metaphysial cartilage are replaced by a layer of new bone which partly seals the epiphysial cartilage from the marrow spaces.
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