国人胎儿形态学研究 Ⅵ.胚胎外生殖器分化和胎儿睾丸位置观察  

STUDlES ON THE MORPHOLOGY IN CHlNESE FETUS VI.OBSERVATION ON DIFFERENTIATION OF EXTERNAL GENTIALIA AND DESCENT OF TESTIS

作　　者：王先荣[1] 孙宏[1] 陈慧玲[1] 刘志勋[1] 郝依群 杨善禄[2] 

机构地区：[1]兰州医学院组胚学教研室 [2]北京师范学院生物系

出　　处：《男性学杂志》1993年第2期92-93,共2页

摘　　要：本文报道了国人9～13周龄43例胚胎外阴生殖器分化的情况与13周龄以上526例男性胎儿睾丸下降的解剖观察与统计。结果表明,外生殖器在9周前未辨认出性别,第10周时可辨认出男性,第12周男女性别区分明显。睾丸下降位置20周龄前全部平髂嵴,21周龄少数降至腹股沟腹环处,26～29周龄大部分在腹股沟管内,30～38周大部分入阴囊。This article reported the observation on differentiation of external genitalia in 43 Chinese fetus at 9-13 week age and descent of testes in 526 Chinese fetus at 14-40 week age by autopsy. The external genitalia of fetus were not distinguished from sex by 9-week age, were shown male in 10-week age, and were developed male and femal 12-week late. The testes of fetus reached the level of crista iliaca by 20-week age. A few of testes descend on abdominal annulus of inguinalis in 21-weekge. Most of testes of fetus arried in inguinal canals in 22-32 week age and entered the scrotum in 33-38 week age.

关 键 词：外生殖器分化 睾丸下降 胎儿 胚胎学 

分 类 号：R329.1[医药卫生—人体解剖和组织胚胎学]