The Effects of Thyroxine on the Development of the Chondrocranium (Neurocranium) of Rana Pipiens Tadpoles
Date of Award
Master of Science
In Rana niniens. thyroid-dependent growth of the hind limbs is not seen until 5 to 7 weeks after feeding begins (Kollros, 1959). Although thyroid hormone is being secreted, the level of circulating hormone is not sufficient to bring about a response. Some tissues fail to respond to thyroid hormone even after huge exogenous doses have been administered, which has been demonstrated by Kaltenbach (1953), with the use of thyroxine-cholesterol pellet implants, found local tissue responses independent of general systemic effects.
The purpose of this study is two fold: (1) to establish the time at which the normal development of the chondrocranium is completed, and (2) to determine whether the rate of chondrocranium development can be accelerated by administering large doses of exogenous hormone.
E. W. Martin
J. E. Berry
P. L. Young
C. E. Urdy
C. L. Ward
Prairie View A&M College
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Date of Digitization
John B Coleman Library
City of Publication
Walton, W. J. (1966). The Effects of Thyroxine on the Development of the Chondrocranium (Neurocranium) of Rana Pipiens Tadpoles. Retrieved from https://digitalcommons.pvamu.edu/pvamu-theses/828