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J Embryol Exp Morphol 3, 376-384 (1955)
Published by The Company of Biologists 1955
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The Development of the Ultimobranchial Body in Xenopus laevis Daudin and its Relation to the Thyroid Gland and Epithelial Bodies

Lauri Saxén and Sulo Toivonen1

Zoological Laboratory of the University of Helsinki

1 Authors' address: Zoological Laboratory, University of Helsinki, P. Rautatiek. 13, Helsinki, Finland.

Received for publication 16 March 1955.

SUMMARY

The ultimobranchial body is a derivate of the pharyngeal cavity which has been found in all vertebrates studied at least at some stage of development. Its origin, development, and structure has been studied in many species but nevertheless nothing certain is known about its significance and activity. Earlier authors have used several terms for this organ, e.g. accessory thyroid gland, lateral thyroid, corpus Y, suprapericardial body, telobranchial body, and postbranchial body. The term mostly used at present, ultimobranchial body, was suggested by Greil (1904).

It is not possible to give a consistent picture of the formation of the ultimobranchial body, since it is evidently different in different vertebrates. In fishes it is formed from the sixth rudimentary visceral pouch (van Bemmelen, 1889); in amphibians Maurer (1888) regards it as being formed from the ventral wall of the pharyngeal cavity, while Greil (1904) derives it from the sixth visceral pouch.


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© The Company of Biologists Ltd 1955