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Taschenbuch. Zustand: Neu. The Development of the Lymphatic System in Man | S. C. J. Van Der Putte | Taschenbuch | Advances in Anatomy, Embryology and Cell Biology | 60 S. | Englisch | Springer | EAN 9783540072041 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - When Budge in the eighth decade of the nineteenth centlll'Y, started his investigations into the origin and development of the lymphatic system, he probably did not expect that these would be the starting-point for disputes that would continue well into our time. But rather than by his results were these disputes intensified by the controversial conclusions of some papers published by Gulland (1894), Ranvier (1897) and Sala (1900), and above all by some new investigations by Sabin (1902-1913) and Huntington (1908-1914) during the first decades of the twentieth century. The most important controversial point was the difference in opinion about the origin of the lymphatic system. An extensive review of the relevant literature is found in O. F. Kampmeier's book: 'Evolution and Comparative Morphology of the Lymphatic System'; Thomas, Springfield, U.S.A. (1969). Whereas some investigators were of the opinion that the lymphatic system was formed from the venous system, there were many others, who believed that this system originates from confluent spaces in the mesenchyme and secondarily communicates with the veins. The most prominent advocate of the first mentioned opinion was Sabin (1902-1913). She believed that the lymphatics are formed by a process of sprouting from the large central veins in a limited number of definitely localized areas, but that these sprouts demonstrate almost immediately their own lymphatic character. From these sprouts separate primordia develop at first; these enlarge, confluence and form new sprouts which grow out into more peripheral parts of the embryo.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - For over a century, the development of the perineum has received ample attention because of the striking complexity of its formation and malformation. In the prolonged disputes at this subject, normal and abnormal development became intricately interwoven and ideas about the normal process were often directed by the anomalies.The unexpected results from an investigation into hereditary congenital anorectal malformations of pig embryos demonstrated the weakness of such interpretations and constructions and underlined the need for a new inquiry into the normal development of the area in human embryos. They showed that although data from malformations may offer extra information about the normal development of the area, great care has to be taken in using that information for the reconstruction of its normal development which should be based first and foremost on the observation of the evolving microscopic anatomy of the region.To avoid the inconsistencies caused by fragmented research in the past, such an investigation should comprise the whole structure of the region from its incipience to birth. The present study offers such a survey. It contradicts current opinion on major developmental events and gives new insights into the origin of the urinary bladder, the subdivision of the cloaca, the transformation of the cloacal mantle into the erectile, fascial and muscular structures of the female and male perineum, and also corrects existing ideas about the formation of the vagina, urethra and vestibulum in the female and the urethra, penis and scrotum in the male. These new findings will be indispensable in unravelling the pathogenesis of challenging perineal malformations. (not yet copy edited, March 16,2004).