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Diagrams illustrating the development of the urinogenital organs of a vertebrate. A, pronephros and segmental duct; B, atrophy of pronephros, development of mesonephros; C, appearance of Mullerian duct; D, development of metanephros, male type; E, the same, female type. The sex gland, ovary and testis is obliquely shaded; phonephros and mesonephros unshaded, metanephros stippled; Mullerian duct heavily shaded. The large chamber to the right, into which these ducts as well as the intestine open, is the cloaca.

Urinogenital Organs of a Vertebrate

Diagrams illustrating the development of the urinogenital organs of a vertebrate. A, pronephros and…