Anthropological Study on the Pelvis of the Korean Fetus

The author has measured 38 items on the pelves of 365 Korean fetuses. ranging from the 4th to the 10th fetal months, and computed 23 indices. The following conclusions have been drawn. 1. The dimensions of the greater pelvis increase about 4 times during the period from the 4th to the 10 th fetal months and the growth rate of the anteroposterior diameters is higher than that of the longitudinal and the transverse diameters. 2. The form of the greater pelvis is high longitudinally , narrow transversely and flattened anteropostriorly as compared with the adult pelvis. 3. The dimensions of the lesser pelvis increase about 3.5 times during the period from the 4th to the 10th fetal months and the growth rate of the longitudinal diameters is higher than that of the transverse and the antero-posterior diameters. 4. The form of the lesser pelvis is low longitudinally , narrow transversely , thick antero-posteriorly and cylindrical as compared with the adult pelvis. 5. The dimensions of the obturator foramen and the acetabulum increase over 4 times during the period from the 4th to the 10th fetal months. 6. There are no differences in the fetal pelvis between both sexes and the sex differences in pelvis occur after birth. 7. There are no differences in all of the items between both right and left sides