Cubical Anatomy of Several Ducts and Vessels by Injection Method of Acrylic Resin

VIII. On the parotid ductal system in some mammals

Abstract

Studies on the ductal system of s a livary glands have been done through variable methods, as described in the preface. Especially of the form, divergency and course of the intralobular ductal system, and even the terminal lumen, however, there are many lacked definitenesses. Succeeding in making corrosion specimens of even the terminals of 2μ on the parotid, their detailed observations, comparing with injected sections, are carried out.
Different from the blood vessel system, the glandular ductal system ends blindly. Zimmermann ('27) says that artificial escapement might be produced, or satisfactory injection can not be done, if secretions much remain in terminal lumina. For clearing up to what extent of deformations of the lumen or producing artificial routes may be brought about by the injection, the author Parotid Ductal System in Some Mammals 333makes observations on resin injected sections of the cattle's submandibular gland with larger and brighter lumina and clearer border of the lumen, on which he can not count in the parotid. And now it can be confirmed that the specimens show some almost physiological swelling, constriction or prominence. Sometimes, especially in the finest portions, destruction of the lumen and artificial products are seen, but minute comparative observations of sections or casts give a right judgement. Accordingly, with all these specimens it is not always possible to get ideal results, yet it is believed that natural features of lumina filled up are shown in most cases, except some swelling by the injection pressure. Now, observations by the author are summarized and discussed with previous scholars' works.