Development of intestinal coiling in anuran larvae
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Development of intestinal coiling in anuran larvae.
In aquatic vertebrates such as the cyclostomes, fishes, and urodele Amphibia, the digestive tract develops as a relatively straight tube characteristicalaly bent toward the right side in the region of the pylorus and duodenum. Aiiuran amphibians excite particular interest because they are the most primitive vertebrate group to deve1,op a highly coiled intestine, such as amniotes generally posse...
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Up to the present, a considerable number of studies have been published on the role of the thyroid hormone in anuran development. The nature of this relationship, however, can not yet be stated to have been elucidated to satisfactory extent. Gordon, Goldsmith and Charipper (1943) reported that anuran metamorphosis was inhibited by thiourea treatment, and experiments on the same line have been p...
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PREVIOUS observations of the development of somatic movements in amphibians concentrated their attention on 'reflex' mechanisms (for review, see Hooker, 1952). Extensive study has been made of the types of movement evoked by tactile stimulation at different stages in early development and on the anatomical basis for such responses. Emphasis was thus placed upon the formation of direct pathways ...
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ژورنال
عنوان ژورنال: Journal of Experimental Zoology
سال: 1951
ISSN: 0022-104X,1097-010X
DOI: 10.1002/jez.1401160204