47
REVIEW ARTICLE
고환의 발생 및 하강
Development and Descent of Testis
Ki Ho Kim, Yong Wook Jung
1From the D epartm ents of U rology and
1Anatom y, D ongguk U niversity School of M edicine, G yeongju, K orea
김기호ㆍ정용욱1동국대학교 의과대학 비뇨기과학교실,
1해부학교실
Embryos with a Y chromosome usually develop testes. The SRY gene on the short arm of the Y chromosome acts as the switch that directs devel- opment of the indifferent gonad into a testis. By the eighth week, Leydig cells begin to secrete testosterone, which induce masculine differentiation of the mesonephric ducts and the external genitalia. Müllerian inhibiting substance (MIS) is produced by the Sertoli cells, which suppresses devel- opment of the paramesonephric ducts, which form the uterus and uterine tubes. The mesonephric ducts, which drained urine from the mesonephric kidneys, play an essential role in the development of the male re- productive system. Testicular descent is a complex-developmental process involving anatomical and hormonal regulation. Today, testicular descent can generally be accepted as a two-stage model with different anatomy and hormonal regulation. The gubernaculums is an important role of tes- ticular descent, and the active proliferation of the gubernacular tip and cremaster muscle, its rhythmic contraction, as well as the chemotactic gradient provided by the calcitonin gene-related peptide (CGRP) result in eventual migration of the testis into the scrotum.
Key Words: Testis, Testicular descent, Testicular hormone (Received: December 17, 2011, Accepted: December 24, 2011)
교신저자 정용욱
동국대학교 의과대학 해부학교실
경주시 석장동 707, 780-714
Tel: 054-770-2404 Fax: 054-771-0769
E-mail: jungyw@dongguk.ac.kr