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41. The Development of the Kidney in Ampullaria (Pila) gigas
Author(s) -
Fernando Wilfred
Publication year - 1931
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1096-3642.1931.tb01042.x
Subject(s) - kidney , anatomy , ureter , mantle (geology) , biology , medicine , surgery , endocrinology , paleontology
S ummary .1 The right kidney and left kidney in the embryo arise as evaginations of the pericardium. Mesodermal cells from the neighbourhood adhere to these evaginations. 2 While the left kidney disappears, the right kidney enlarges and comes into contact with the invagination of the ectoderm which later forms the mantle‐cavity in the posterior region. 3 The right kidney then opens into the mantle‐cavity. 4 That portion of the mantle‐cavity with which the kidney comes into contact becomes a tubular organ distinct from the mantle‐cavity, and is called the “ureter.” 5 As a result of torsion, the right kidney of the embryo becomes the left, posterior kidney of the adult. 6 The ureter becomes dorsal and lies anterior to the left, posterior kidney. It becomes the anterior kidney of the adult. 7 In the adult the glandular posterior kidney, which opens internally into the pericardium, discharges its products into the anterior kidney, and thence to the exterior. 8 The anterior kidney of the adult Ampullaría is a modified and enlarged ureter, homologous with the ureter of Vivipara .