The Neuroniorphology of the cortical Vasculatures in the Monkey Kidney

Abstract

The present work looks into the vascular innervation in the renal cortex of the monkey (Macaca fuscata fuscata). The results obtained under the use of Suzuki's silver technipue for paraffin sections, are summerized as follows: 1. The large arterial vessels, such as the interlobar, the arcuate or the interlobular artery, have the nerve-plexus pertaining respectively to the apventitia and media of them. However, the medial nerve-plexus in the interlobar or arcuate, are not seen to be remarkably well-developed. 2. The findings related to the myo-neural junction in the muscular coats of the large arterial vessels, especially, of the interlobular, are as follows: namely, the delicate nerve-fibers arising from the preferred portion (v. vid. Fig. 3) characterized by containing the transmittal cells (=interstitial cells), of the adventitial nerve-plexus, form the much delicate terminal networks with some knot-like structures to make contact, to say the least, with the surface of the muscular cells. 3, In the adventitia of an interlobular artery, a special nerve end-organ being composed of several nuerofibrillar swellings (v. vid. Fig. 8), is observed. In addition, existence of the much thick nerve-fibers of 3-5μ caliber is, too, recognized in the adventitia of the large arterial ones. These nerve-fibers and the above-mentioned nerve end-organ are thought to be sensory in functional nature.4. The findings concerning the innervation of the capillary, on the wall of which the much fine nerve-nets with the argyrophil small appendages of knot-lik form are observable, indicate that capillary nerve-elements seem to discharge a function sesing the chemical stimuli from the surrounding tissue. Furthermore, the other finding, which suggests existence of a close functional relationship between the capillary and renal tubule tissue, is obtained (v. vid. Fig. 14). The large venous vessels have the nerve-plexus, for them-selves, pertaining to them, and the much delicate nerve-nets derived of such nerve-pleus are obsevable on their wall. On the other hand, the small venous ones not having the nerve-plexus proper to them, seem to be supplied with the nerve-plexus pertaining to the corresponding arterial ones.6. The author's findings negative the Abraham's opinion ('64) refusing admisson of anastomosing phenomena of nerve-fibers. In addition, from a critical view-point of the Knoche's terminal reticulumm theory ('50, '51), some problems concerning the morphology of nerve endings, including the argyrophill appendages of the terminal reticulum, were discussed. Suzuki's observations ('63, '65) concerning the transmittal cells and fine structures of myo-neural junction on the microscopic level were cited, and the droblems related to the morphology of the myo-neural junction were discussed.