Abstract
1. In decorticate monkeys, location of receptor for the righting reflexes acting upon the body was examined.
2. When lying in the lateral position, an electrical stimulation of the uppermost splanchnic nerve evoked stereotyped changes in position of all four limbs, identical in pattern with the righting reflexes acting upon the body, which were executed by reciprocal responses of the antagonistic muscles of four limbs.
3. The same responses of the skeletal muscles were also induced by an electrical stimulation of the mesentery and of the thoracic and cervical sympathetic trunks.
4. Moreover, the same responses of the skeletal muscles were evoked by an electrical stimulation of the proximal cut end of the splanchnic nerve, whereas no response was caused by stimulation of its distal end.
5. From these results, it was concluded that the receptors for the righting reflexes acting upon the body lie in the mesentery.
6. The conclusion obtained from our experiments is supported by the body reflexes acting upon the body in spinal men described by POLLOCK and his coworkers which are readily evoked while immersed in water in a swimming pool.
