人下鼻甲介粘膜に分布する動脈の形態学的研究

抄録

The author made the histological studies on the distributing arteries of the mucous membrane of the human inferior nasal concha. The specimens were obtained by means of the operation. After fixation with Zenker-formalin or Levi's solution, the trimmed pieces were embedded in paraffin, and cut into frontal, complete serial sections 7μ in thickness. Hematoxylineosin stain, Heidenhain's azan stain, Weigert's stain for elastic fibers, Heidenhain's iron-hematoxylin stain and periodic acid-Schiff stain were used. According to the author's observations, arteries of the mucous membrane of the inferior nasal concha are divided into two, that is, arterial plexus in the deep layer and that in the middle layer of the mucous membrane. Arterial plexus in the middle layer braches off subepit- helial arteries, arteries in the layer of glands, precapillary arterioles and capillaries. Author studied the morphological interrelationship of these arteries and their histological structures. Moreover, "Pol- sterarterien". which are found in the deep and middle layer of the lamina propria mucosa and their specific structures, were mentioned. Author divided of "Polsterarterien" into two types, that is, the valve-shaped process type and the thickened intima type and then observed the histological structures in detail.
In the valve-shaped process type, 1) the tunica media of blood vessels is convex into a lumen of blood vessel with the intima, and most parts of club-spaped process, is free from the blood vessel- wall, except its base. 2) "Polster" originates usually from the branching portion of the vessels and runs towards periphery. There are cases in which "Polster" enters into the both branches or only into the the main blood vessel. These "Polster" consist mainly of longitudial smooth muscle fibers with a small amount of collagen and fine elastic fibers. Longitudinal smooth muscle fibers in "Polster" connect with the smooth muscle layer of the tunica media in the blood vessel wall at the basal portion of the process. Tunica intima of "Polster" runs into the intima of the blood vessel wall itself. Therefore, the internal elastic lamina of both "Polster" and blood vessel wall are connected each other. 3) On the inner surface of the thickened blood vessel inculding "Polster", remarkably waved plicae are not observed. The neighbouring portion of the blood vessel wall does not show any abnormalities.
As regards the thickened intima type, 1) this type consists of the thickened intima, and longitudinal smooth muscle fibers in inner layer of internal elastic lamina. In this case, the lumen of bloodvessels become more narrower than that of the valve-shaped process type, but has never been compl-etely closed. 2) "Polster" in this type has usually a fairly small amount of elastic fibers and is not found in the capillaries which are lacking of a tunica media, like a valve-shaped process type. The neighbouring wall of blood vessels including "Polster" also does not show abnormalities.
As results of above mentioned observations, the author considers that "Polster", regulates arterial blood flow through capillary beds to the pseudo-erectile tissue, playing an important role incontrollin the physiological swelling of the inferior nasal concha. Also, in only one case the author found the direct arterio-venous anastomosis.