Abstract
The present paper dealt with the problems of blood-vessels and nerve-endings in the salivary glands, with the special reference to the duct system. Using the salivary glands in the golden hamster, as in the previous studies, the specimens were treated by a method of the injection with India ink and the silver-impregnation method of SUZUKI.
1. The parenchymal arterioles, which are derived from interlobular arteries, ramify to form close capillary networks around the ducts and alveoles. Among the parts of the salivary glands, the striated ducts are supplied most abundantly by capillary networks with elongated meshes.
2. In general the capillary network around the striated duct is of epilemmal character, but some capillaries derived from them pass through the basement membrane to form hypolemmal network among cells lining the duct.
3. In preparats stained with Azan the figures of red-stained substance attached to the inner wall of the hypolemmal capillary could often be observed. The origin of this substance could also be traced back to the cytoplasm of the duct cell.
4. The blood of the capillaries both in hypo- and epilemmal networks is collected into the venules in the parenchym, and carried away from the gland by interlobular veins.
5. Forming delicate terminal reticulum with CAJAL's interstitial cells and unmyelinated nerve-fibers, the nerve elements in vegetative nature supply the whole salivary glands. The nervous terminal reticulum, as reported by many other investigators, situate for the greater parts in the connective tissues surrounding the ducts and alveoli.
6. Very delicate nerve fibrils of unmyelinated nature derived from the reticulum pass through the basement membrane of the striated duct, and run waving, without any influence of the running directions of the ducts, among the cells in their hyponuclear regions.
7. The nerve fibrils supplying the granular duct terminate to the so-called intercalated cells in the duct. In other words, the granular duct receives the nervous stimuli from two different nerve reticuli. one with intercalated cells lies inside the basement membrane, another outside the duct with CAJAL's cells.
