Bouw G M, Stolte L A, Baak J P, Oort J
Eur J Obstet Gynecol Reprod Biol. 1978 Apr;8(2):73-6. doi: 10.1016/0028-2243(78)90130-2.
The relationship of placental components to birth weight was investigated by stereology. 37 placentas from nonpathological pregnancies delivered after a period of 224-303 days of amenorrhea were examined. The umbilical cord was clamped immediately after birth. The ratios of the volume, the surface, the length of the villous vessels and the surface of the villi with birth weight showed a decrease after 277 days of amenorrhea. In contrast to this decrease, the ratio of the volume of the trophoblast with birth weight seems to increase. No difference could be found for the ratios of the placental volume (placental index), the volume of the villous tissue, the volume of the intervillous space and the volume of the nonfunctional tissue with birth weight. These ratios reveal a quantitative morphological base for the clinical experience that postmature fetuses are at a higher risk through deterioration of the placenta.
采用体视学方法研究胎盘各组成部分与出生体重的关系。对37例闭经224 - 303天的非病理性妊娠分娩后的胎盘进行了检查。出生后立即钳夹脐带。闭经277天后，绒毛血管的体积、表面积、长度以及绒毛表面积与出生体重的比值均下降。与此下降趋势相反，滋养层体积与出生体重的比值似乎增加。胎盘体积（胎盘指数）、绒毛组织体积、绒毛间隙体积和无功能组织体积与出生体重的比值未发现差异。这些比值为临床经验提供了定量形态学依据，即过期胎儿因胎盘功能恶化而面临更高风险。
