. Human physiology (Volume 1) . tion is prepared. Within the membraneare numerous follicles, which, with the exhalants, secrete a mucous fluid, called byHaller succus intestinalis. Their entirenumber in the whole alimentary canal isestimated by Dr. Horner to be 46,900, about four or five fingers breadth fromthe pylorus, the duodenum is perforated bythe termination of the biliary and pancrea-tic ducts, which pour the bile and pan-creatic fluids into it. (Fig. 123.) Generally,these ducts enter the intestine by one open-ing ; at times, they are distinct, and lie along-side each other. The s
. Human physiology (Volume 1) . tion is prepared. Within the membraneare numerous follicles, which, with the exhalants, secrete a mucous fluid, called byHaller succus intestinalis. Their entirenumber in the whole alimentary canal isestimated by Dr. Horner to be 46,900, about four or five fingers breadth fromthe pylorus, the duodenum is perforated bythe termination of the biliary and pancrea-tic ducts, which pour the bile and pan-creatic fluids into it. (Fig. 123.) Generally,these ducts enter the intestine by one open-ing ; at times, they are distinct, and lie along-side each other. The structure of the duo-denum is the same as that of the whole ofthe intestinal canal. The muscular coat is,however, thicker, and the peritoneal coatonly covers its first portion, passes beforethe second, and is totally wanting in the American Journal of the Medical Sciences, May, 1835, p. cit. ii. 246. a, a. Veins filled with whiteinjection. b, b. Arteries filledwith red. A beautiful rete ofcapillaries between the two. have. DIGESTIVE ORGANS. 491 third, which we have described as included in the transverse me-socolon. The other two portions of the small intestine are of consider-able length ; the jejunum commencing at the duodenum, and theileum terminating, in the right iliac fossa, in the first of the greatintestines—the caecum. They occupy the middle and almostthe whole of the abdomen, being surrounded by the great intes-tine E F F F G H I, Fig. 129. The jejunum is so called, frombeing generally found empty ; and the ileum, from its numerouswindings. The line of demarcation, however, between theduodenum and jejunum, as well as between the latter and theileum, is not fixed : it is an arbitrary division. The jejunum has, in-ternally, the greatest number of valvules conniventes and ileum is the lowest portion. It is of a paler colour, and hasfewer valvulae conniventes. The jejunum is situate at the upperpart of the umbilical region; the ileum at the lower part of
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
