The tail of Ascaphus : a historical resume and new histological-anatomical details

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dc.contributor.advisor De Villiers, C. G. S.
dc.contributor.advisor Malan, M. E.
dc.contributor.advisor Du Toit, C. A. Van Dijk, D. E. (D. Eddie)
dc.contributor.other University of Stellenbosch. Faculty of Science. Dept. of Botany and Zoology 2011-08-01T09:10:31Z 2011-08-01T09:10:31Z 1954-12
dc.description Thesis (MSc)-- University of Stellenbosch, 1954 en_ZA
dc.description Published in the Annals of the University of Stellenbosch, Volume 31, Section A, No.1 (1955)
dc.description.abstract ENGLISH ABSTRACT: The pelvic girdles of the two anuran genera Ascaphus and Leiopelma of the family Ascaphidae are very similar. Attached to them by cartilage (or connective tissue in some Ascaphus specimens) is a cartilaginous, in Leiopelmu somewhat ossified, epibubis. In Ascaphu8, as in Xenopus, the epipubis originates from two Anlages, and its muscles are also paired in the Ascaphidae, while in Xenopus only one is present, although this also appears to originate (rom two muscles. The cloaca extends behind the pelvic girdle in both sexes in Al:lcaphus, and it is supported by two rods consisting of strong connective tissue (Faserknochen?). These rods are attached to the ventral surface of the pelvic girdle, in the female closely, in the male by means of tendons. Between the rods and the epipubis a broad tendinous band extends, which is thick in the male; in the latter the mm. compressores cloacae have their origins posteriorly on the rods, while in the female the rods are completely imbedded in these muscles posteriorly. In the female particularly there are transverse muscle fibres which are not striped although probably derived from the mm. compressorcs cloacae. Behind the pelvic girdle there is cavernous tissue in both layers of the tunica muscularis, and ventrally it covers the mm. eompressores cloacae. The circular and longitudinal muscle layers are poste riorly separated by gliding planes. The cloaca is supplied by branches of the a. mcsenterica posterior and the au. pudendae anteriores, and is drained by the vv. pudendae and a small medial v. eaudalis. The cloaca is innervated dorsally by the plexus ischio·coccygeus and ventrally by a branch of the n.ischiadicus (the n. pudendus). The cloaca of the male serves as a copulatory organ. There is internal fertilization. en_ZA
dc.description.abstract No Afrikaans abstract available.
dc.format.extent 71 p. : ill.
dc.language.iso en_ZA en_ZA
dc.publisher Stellenbosch: University of Stellenbosch en_ZA
dc.subject Ascaphus -- Anatomy en_ZA
dc.subject Pelvic girdle en_ZA
dc.subject Cloaca en_ZA
dc.subject Leiopelma en_ZA
dc.subject Epipubis en_ZA
dc.subject Muscles of the pelvic region en_ZA
dc.subject Dissertations -- Zoology en_ZA
dc.subject Theses -- Zoology en_ZA
dc.subject Tailed frog -- Anatomy en_ZA
dc.title The tail of Ascaphus : a historical resume and new histological-anatomical details en_ZA
dc.title.alternative Annals of the University of Stellenbosch, Volume 31, Section A, No.1 (1955) en_ZA
dc.type Thesis en_ZA
dc.description.version The copy we received from the author were pages individually scanned in as JPEG images. en_ZA
dc.rights.holder University of Stellenbosch en_ZA
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