Abstract
The afferent impulses from the nerve trunk or a single nerve fiber to the kidney and testis of toad due to mechanical stimuli have been studied by means of oscilloscopic recording.
1) Kidney and testis are innervated segmentally with sympathetic trunks from cranial to caudal.
2) The receptive field of a single afferent fiber of these nerves is far smaller (5×5mm.2) than that of splanchnic nerve fibers (10×10mm.2).
3) The adaptation of these receptors is relatively, at times, extremely slow. The former probably belongs to the type (b) in Catton's classification or to category of type ‘A’ endings of Fessard and Segers, and the latter seems to belong to the type (d) in Catton's classification or to category of ‘pain’endings of Fessard and Segers.
