Department of Anatomy, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae Ward, Kawasaki, Kanagawa, 216-8511, Japan.
Int J Legal Med. 2012 Sep;126(5):703-11. doi: 10.1007/s00414-012-0718-2. Epub 2012 May 30.
The purposes of this study are to examine documented fetal skeletal remains of Japanese, to measure the basilar part of the occipital bone, and to develop diagnostic standards for estimating fetal age at death which can be applied to poorly preserved skeletons. The sample is composed of 272 Japanese individuals of the early to middle twentieth century, whose ages were recorded in months from gestations of 5 to 11 months. The measurement items used here are the length, breadth, and index of the basilar part. The regression equations of gestational age in months for one or two variables were calculated. The results indicated that it is possible to use the regression equations to estimate the age at death of fetuses directly from the basilar part measurements. Another indicator for estimating age at death from the basilar part is the ratio of the width to the length, which was here expressed as the index of the basilar part. The width exceeded the length at 7 months and the basilar part changed with age from an anteriorly posteriorly long shape to a bilaterally wide one. It is concluded that the basilar part is a good indicator for estimating the fetal age at death.
本研究旨在检查日本有记录的胎儿骨骼遗骸，测量枕骨基底部，并制定可应用于保存不佳骨骼的估计胎儿死亡年龄的诊断标准。样本由 272 名 20 世纪早期至中期的日本人组成，其年龄以妊娠 5 至 11 个月的月数记录。此处使用的测量项目是基底部的长度、宽度和指数。计算了一个或两个变量的妊娠月的回归方程。结果表明，使用回归方程可以直接从基底部测量值来估计胎儿的死亡年龄。另一个从基底部估计死亡年龄的指标是宽度与长度的比值，这里表示为基底部指数。7 个月时宽度超过长度，基底部随年龄从前后长形变为双侧宽形。因此，可以得出结论，基底部是估计胎儿死亡年龄的一个很好的指标。
