RELATION OF CERVICAL SYMPATHETIC NERVES TO ACTIVITY OF THE THYROID

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Abstract
The distal ends of the cervical sympathetic trunks were stimulated after the method of Haney in 8 rabbits. An increase in B. M. R., similar to that observed by Haney, was observed in only 1 of the 8 rabbits. No special significance could be ascribed to this single observation. In 10 rabbits and 2 cats the cervical sympathetic trunks were removed from the stellate to the superior cervical ganglia, including as much of the former ganglia as possible. In 7 of the 9 rabbits studied longer than 30 days the B. M. R. was reduced from 10 to 30% (avg. about 15%) below the preoperative control level. The B. M. R. was decreased 20 and 35% in the cats. The B. M. R. of 2 control rabbits submitted to a mock operation remained uniform for from 120-240 days. Bilateral cervical sympathectomy in rabbits rather uniformly caused a decrease in B. M. R.