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从胚胎发育过程来说,睾丸原先位于腹腔内,自孕期26周开始移行。第一站是从腹腔内移行到腹股沟处,第二站自腹股沟移行到阴囊内。如果孩子出生后睾丸不在阴囊内,称为隐睾。睾丸移行的过程受到内分泌的控制及局部解剖的影响。刚出生的足月新生儿中,隐睾的发生率为2.5～3%,其中约40%为双侧隐睾。早产儿、出生低体重儿(体重低于2500克)隐睾的发生率较足月新生儿高。出生有隐睾的,绝大多数于生后3个月内睾丸下降到阴囊内,这与该月龄的
From the embryonic development process, the testicles were originally located in the abdominal cavity, since 26 weeks of pregnancy began to migrate. The first stop is from the intra-abdominal migration to the groin, the second leg from the groin to the scrotum. If the child is born after the testicles are not in the scrotum, known as cryptorchidism. The process of testicular migration by endocrine control and local anatomy. The incidence of cryptorchidism is 2.5-3% in newborn full-term newborns, of which about 40% are bilateral cryptorchidism. Preterm children, low birth weight infants (weight less than 2500 grams) the incidence of cryptorchidism than full-term newborns. Cryptorchidism was born, the vast majority of testicular descent within 3 months after birth to the scrotum, which with the age of