Development of the urinary system

（重定向自Urethral plate）

A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction. The common genital cord is labeled with gc. * 3. Ureter.
* 4. Urinary bladder.
* 5. Urachus.
* cl. Cloaca.
* cp. Elevation which becomes clitoris or penis.
* i. Lower part of the intestine.
* ls. Fold of integument from which the labia majora or scrotum are formed.
* m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the common genital cord.
* ot. The gonadal ridge from which either the ovary or testis is formed.
* ug. Sinus urogenitalis.
* W. Left Wolffian body.
* w, w. Right and left Wolffian ducts.

Tail end of human embryo thirty-two to thirty-three days old. The entodermal cloaca is visible at center left, labeled in green

Development of external genitalia. A: common development. C,E: male development. B,D, F: female development

Diagrams to show the development of male and female generative organs from a common type.

The development of the urinary system as a part of the prenatal development, concerns the urinary system and sex organs. The latter is a part of the stages of sexual differentiation.

The urinary and reproductive organs are developed from the intermediate mesoderm. The permanent organs of the adult are preceded by a set of structures which are purely embryonic, and which with the exception of the ducts disappear almost entirely before the end of fetal life. These embryonic structures are on either side; the pronephros, the mesonephros and the metanephros of the kidney, and the Wolffian and Müllerian ducts of the sex organ. The pronephros disappears very early; the structural elements of the mesonephros mostly degenerate, but the gonad is developed in their place, with which the Wolffian duct remains as the duct in males, and the Müllerian as that of the female. Some of the tubules of the mesonephros form part of the permanent kidney.

单词	Urethral plate
释义	Urethral plate 英语百科 Development of the urinary system （重定向自Urethral plate） The development of the urinary system as a part of the prenatal development, concerns the urinary system and sex organs. The latter is a part of the stages of sexual differentiation. The urinary and reproductive organs are developed from the intermediate mesoderm. The permanent organs of the adult are preceded by a set of structures which are purely embryonic, and which with the exception of the ducts disappear almost entirely before the end of fetal life. These embryonic structures are on either side; the pronephros, the mesonephros and the metanephros of the kidney, and the Wolffian and Müllerian ducts of the sex organ. The pronephros disappears very early; the structural elements of the mesonephros mostly degenerate, but the gonad is developed in their place, with which the Wolffian duct remains as the duct in males, and the Müllerian as that of the female. Some of the tubules of the mesonephros form part of the permanent kidney.
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