【摘要】 用 X 线摄片的方法,研究了193例(男104,女89)胎龄12～35周胎儿群体中四肢长骨生长发育的动态及其特点。1.在四肢长骨长轴生长上,尺、桡骨为右>左,其他长骨亦以不对称性的为多,表明侧差在胎儿期已存在。2.性差不明显,表明出生后的性差至少在胎儿期(<35周)尚未开始。3.在胎儿不同时期,四肢长骨长轴的生长速率不相同。本文提出可划分为2个生长阶段:(1)12～18周为快速同步生长期,各长骨增长速度快,步调一致,上肢骨比相应的下肢骨长;(2)19～35周为减慢离散生长期,生长速度相对减慢。此时,下肢骨长度超过了相应上肢骨的长度,互相离散。更多还原

【Abstract】 The dyhamics and characteristic of the fetal growth in limb long bones werestudied in 193 fetuses(104 male,89 female)with radiographic method,Fetal-ageranged from 12-35 weeks.The results are as follows:1(?) It has been found thatthere is a difference existed between the left and the right side in the longitudinalaxis growth of limb long bones.The R>L in ulna and radius.In other long bones.most cases are asymmetrical.This means that the side-difference has been existedduring the fetal life.2.The sex-difference is non-significant during the fetal lifeat the age before 35th week.3.It has been found that the growing speed of limblong bones are different during the different periods of fetal live.It is suggestedthat the growth of fetal limb long bones be divided into two stages:(1)12th-13thweek is a high-speed synchronism stage,the length increased fast and generally theupper limb bones are longer than the relevant lower l(?)mb bones;(2)19th-35thweek is a reduced-speed divergent stage,the growing speed decreased relatively,helower limb long bones are over the upper in length.更多还原