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- The development of the gonads is part of the prenatal development of the reproductive system and ultimately forms the testes in males and the ovaries in females. The gonads initially develop from the mesothelial layer of the peritoneum. The ovary is differentiated into a central part, the medulla, covered by a surface layer, the germinal epithelium. The immature ova originate from cells from the dorsal endoderm of the yolk sac. Once they have reached the gonadal ridge they are called oogonia. Development proceeds and the oogonia become fully surrounded by a layer of connective tissue cells (pre-granulosa cells). In this way, the rudiments of the ovarian follicles are formed. In the testis, a network of tubules fuse to create the seminiferous tubules. Via the rete testis, the seminiferous tubules become connected with outgrowths from the mesonephros, which form the efferent ducts of the testis. The descent of the testes consists of the opening of a connection from the testis to its final location at the anterior abdominal wall, followed by the development of the gubernaculum, which subsequently pulls and translocates the testis down into the developing scrotum. Ultimately, the passageway closes behind the testis. A failure in this process causes an indirect inguinal hernia. Germ cells migrate from near the allantois and colonize the primordial gonads. In the female, the germ cells colonise the cortex and become oogonia. In the male, the germ cells colonise the seminiferous cords of the medulla, becoming spermatogonia. (en)
- 性腺的發育是生殖系統在胚胎發育過程中的一環，在男性會發育為睪丸，女性則為卵巢。 卵巢的部分會分化為中央的髓質以及外部的生殖上皮。未成熟的卵源自於卵黃囊背側內胚層的細胞，一旦他們到達生殖嵴即被稱為卵原細胞。卵原細胞的週邊會圍繞著一層由間質構成的結締組織細胞(的前身)。這是卵巢內濾泡形成的基本原理。 (zh)
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- Development of the gonads (en)
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- 性腺的發育是生殖系統在胚胎發育過程中的一環，在男性會發育為睪丸，女性則為卵巢。 卵巢的部分會分化為中央的髓質以及外部的生殖上皮。未成熟的卵源自於卵黃囊背側內胚層的細胞，一旦他們到達生殖嵴即被稱為卵原細胞。卵原細胞的週邊會圍繞著一層由間質構成的結締組織細胞(的前身)。這是卵巢內濾泡形成的基本原理。 (zh)
- The development of the gonads is part of the prenatal development of the reproductive system and ultimately forms the testes in males and the ovaries in females. The gonads initially develop from the mesothelial layer of the peritoneum. Germ cells migrate from near the allantois and colonize the primordial gonads. In the female, the germ cells colonise the cortex and become oogonia. In the male, the germ cells colonise the seminiferous cords of the medulla, becoming spermatogonia. (en)
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- Development of the gonads (en)
- 性腺的發育 (zh)
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- Development of the gonads (en)
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