抄録
(1) After the intramuscular injection of T3, T4 was increased in the anterior hypothalamus, and T3 in the hypophysis.
(2) Two hrs. after the intramuscular injection of T4, 2 fold increase of T4 and 3 fold of T3 were seen in the anterior hypothalamus, while in the hypophysis, T4 increased 3 times, and T3 4 times. No change was observed in the medial and the posterior hypothalamus.
(3) T3 and T4 are considered to constitute feedback type mechanism with TRF and TSH, respectively.
