File:Rugh 094.jpg

Photograph of endocrine anlagen at the 5 mm stage of the frog tadpole

Derivatives of Forebrain. At this stage of development the forebrain alone has distinguishing derivatives. Ventral to the notochord there develops a vesicular outpocketing of the floor of the forebrain known as the infundibulum. Its cells will contribute later to the formation of the pituitary gland, in conjunction with a cluster of pigmented ectodermal cells seen between the infundibulum and the roof of the pharynx. This cluster of cells is known as the epithelial hypophysis.

Reconstruction of the 5 mm. tadpole in sagittal section. It is believed that the more anterior infundibulum will form the pars nervosa or posterior pituitary gland. The more posterior hypophysis can be identified as contributing to the anterior pituitary gland (pars distalis, pars intermedia, and pars tuberalis of mammals).

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Rugh R. Book - The Frog Its Reproduction and Development. (1951) The Blakiston Company.

Cite this page: Hill, M.A. (2024, April 28) Embryology Rugh 094.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Rugh_094.jpg

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