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Mesonephros
The mesonephros ((ギリシア語:middle kidney)) is one of three excretory organs that develop in vertebrates. It serves as the main excretory organ of aquatic vertebrates and as a temporary kidney in reptiles, birds, and mammals. The mesonephros is included in the Wolffian body after Caspar Friedrich Wolff who described it in 1759. (The Wolffian body is composed of : mesonephros + paramesonephrotic blastema)
==Structure==
The mesonephros acts as a structure similar to the kidney that, in humans, functions between the sixth and tenth weeks of embryological life. Despite the similarity in structure, function, and terminology, however, the mesonephric nephrons do not form any part of the mature kidney or nephrons.〔
In humans, the mesonephros consists of units which are similar in structure and function to nephrons of the adult kidney. Each of these consists of a glomerulus, a tuft of capillaries which arises from lateral branches of dorsal aorta and drains into the inferior cardinal vein; a Bowman's capsule, a funnel like structure which surrounds the glomerulus; and a ''mesonephric tubule'', a tube which connects the Bowman's capsule to the mesonephric duct.〔(【引用サイトリンク】url=http://www.embryology.ch/anglais/turinary/devebauche03.html )〕 A unit consisting of a single glomerulus and the Bowman's capsule surrounding it is called ''renal corpuscle'', and a unit consisting of single renal corpuscle with its associated mesonephric tubule is called a "nephron"〔 or "excretory mesonephric unit".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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