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Biomedical subjects

W D Trotter

Publications and source records attributed to W D Trotter.

13 recordsLinked to original sources
PubMed1980

Growth spurt in rat cranial bases transplanted into adult hosts.

The growth of young rat cranial bases, consisting of the basioccipital, basisphenoid and a fragment of presphenoid bones, transplanted to older sex-matched isohistogenic hosts has been studied longitudinally. Detailed figures are given for absolute growth and velocity of growth both in transplants and in situ. Similarities between the pattern of growth of basisphenoid and in particular the timing of the so-called adolescent growth spurt in the transplanted bones and in situ were found. There was less similarity in the pattern of velocity changes in basiocciput. This was attributed to resorption of basion in the transplants. Significant negative correlations were found between host age and basioccipital length in the females and the velocity of growth of the basisphenoid in the males between 47 and 54 days. There was also a trend for host age to be negatively correlated with basisphenoid length in the males. These findings support the view that intrinsic, presumably genetic, factors regulate the pattern of timing of growth velocity changes in the cranial base.

Aging↗
PubMed1978

Growth of transplants of rat humerus following circumferential division of the periosteum.

The growth of transplants of young rat humeri has been studied following circumferential division of the periosteum at either the proximal or the distal end of the shaft. Periosteal division resulted in bones that were longer than those in which the periosteum was not cut. Following proximal division the experimental bones grew 30% more at both ends than the control bones and 16% more at the proximal end following distal division. There was, however, no difference between the growth of the experimental and control bones at the distal end following distal division of the periosteum. The experimental humeri had less new subperiosteal bone deposited over their diaphyses than the control humeri. These findings support the view that the periosteum is under tension as a result of the activity of the growth plates, and that changes in periosteal tension affect both the growth in length and the deposition of subperiosteal bone.

Animals↗