The Effects of Thyroxine on the Development of the Chondrocranium (Neurocranium) of Rana Pipiens Tadpoles

Author

Weldon Judd Walton, Prairie View A&M College

Date of Award

8-1966

Document Type

Thesis

Degree Name

Master of Science

Degree Discipline

Biology

Abstract

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.

Committee Chair/Advisor

E. W. Martin

Committee Member

J. E. Berry

Committee Member

P. L. Young

Committee Member

C. E. Urdy

Committee Member

C. L. Ward

Publisher

Prairie View A&M College

Rights

Date of Digitization

12-9-2021

Contributing Institution

John B Coleman Library

City of Publication

Prairie View

MIME Type

Application/PDF

Recommended Citation

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