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Areal growth in the human fetal parietal bone

✍ Scribed by Fumio Ohtsuki

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
371 KB
Volume
53
Category
Article
ISSN
0002-9483

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✦ Synopsis

Abstract

The areal growth of the human fetal parietal bone is described using 51 dissected right parietal bones of Japanese fetuses ranging from the fifth month to term. Their shadows were taken on printing paper and analyzed by a sonic digitizer.

The absolute growth of the projected area of the fetal parietal bones progresses at a fairly constant rate during the latter half of the fetal period, despite some deceleration in the 9–10th month. By allometric analysis, the allometric coefficients against crown‐rump length are 2.201 for males, 2.202 for females, and 2.204 for both sexes, respectively. The allometry is essentially monophasic, showing no inflection point, indicating a change in the slope of the regression line; that is, the growth of the human fetal parietal bone is continuous with a constant specific growth rate. These results are discussed in connection with growth in thickness of the bone.

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## Abstract The development of the normal human upper tibial growth plate was studied at autopsy in 46 stillborns and 79 newborns of 20–41 weeks gestational age. During this time period, the histology of this plate evolves from a highly cellular structure with relatively poor columnar organization