Manual of human histology . the peritonceum, it does not exist at all. Thefree surface of both lamellse of the peritonaeum is lined by asimple tesselated epithelium, whose slightly flattened, polygonal,nucleated cells measure, on the average, OOl; they are soclosely united and so constantly kept moist, that the freeserous surface appears perfectly smooth and shining. The peritoncBum is, in general, but scantily supplied withvessels; they are most abundant in the omenta, in the viscerallayer and in the subserous tissue, in which last alone, lym-phatics have as yet been found. The nerves are als
Manual of human histology . the peritonceum, it does not exist at all. Thefree surface of both lamellse of the peritonaeum is lined by asimple tesselated epithelium, whose slightly flattened, polygonal,nucleated cells measure, on the average, OOl; they are soclosely united and so constantly kept moist, that the freeserous surface appears perfectly smooth and shining. The peritoncBum is, in general, but scantily supplied withvessels; they are most abundant in the omenta, in the viscerallayer and in the subserous tissue, in which last alone, lym-phatics have as yet been found. The nerves are also butfew, and are especially to be met with in the omentum, themesenteria, and hepatic ligaments, where they accompany § 148. Muscular tunic of the alimentary canal.—The whole alimen-tary tract, from the stomach to the rectum., possesses a specialmuscular coat, which, however, does not everywhere presentthe same conditions. In the stomach the muscular tunic varies in thickness ; at THE AlJMENTAllY CANAL. 83. 2. circular the fundus it is thin {\—i); in tlie middle, it has a thicknessof about i; in the p. 200. pyloric region, finally,about 2 or even 1. Itconsists of three incom-plete laj^ers : 1. mostexternally, longitudifialfibres, especially at thecardia, Mhere they arisefrom the expansion of apart of the longitudinalfCave^ oi \\\e oesophagus;and also at the pylorus ^k^and in the p)ars pylo- , whence, tensely ~^ ^ stretched, they are continued upon the duodenummuscles, in the middle region, from the fundus to the pylorus;where they are accumulated, constituting the so-called sphincterof the pjylonts; 3. most internally, oblique fibres, which, in con-nexion with the circular fibres, embrace the fundus as in a sling,and run obliquely upon the anterior and posterior walls of thestomach, towards its greater curvature, where they terminate uponthe outer surface of the mucous membrane or unite together. In the small intestine, the muscular coat is somewhat
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
