By James Dunlop Lickley
An creation to Gastro-Enterology: A scientific examine of the constitution and services of the Human Alimentary Tube covers the analysis and remedy of alimentary tube problems. This booklet is geared up into 4 elements encompassing 19 chapters that assessment the elemental constitution, divisions, and vascular preparations of alimentary tube. a number of the themes coated within the publication are the vascular and frightened capabilities of the alimentary tube; its lining membrane and the disposition of its belly half; mechanism of the preparatory, ultimate digestive, and absorptive segments. different chapters take care of the operations of the expulsive segments, the real positive factors of the controlling fearful mechanism, and the results of alimentary discomfort. The security mechanisms targeted to the alimentary tube are defined. The final chapters are dedicated to the worthwhile medical purposes of the expulsive segments. The ebook delivers valuable info to medical professionals, scholars, and researchers.
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Extra info for An Introduction to Gastro-enterology. A Clinical Study of the Structure and Functions of the Human Alimentary Tube
Correspondingly it is in these portions that the greatest amount of the products of digestion is absorbed. Absorption at a reduced rate, however, is carried on along the greater part of the ileum, and probably a slight amount of digested material is absorbed in the first part of the great intestine. The structure of the individual parts of the alimentary tube gives a clear indication of. this. The two chief requirements for maximum absorptive activity are ( ι ) a large surface, and (2) a profuse vascular supply.
The secretion of the pancreas is stimulated partly by nervous impulses through the vagi, and partly by a hormone—secretin—derived from cells of a large stretch of the intestinal wall. There is a distinct difference in composition between the pancreatic juice stimulated by nervous activity and that stimulated by the hormone. Pancreatic juice resulting from stimulation of the vagi is rich in ferments but poor in alkali. The juice produced by chemical action has the opposite characteristics—it is rich in alkali but poor in ferments.
The cardiac glands secrete mucus in an alkaline medium, (b) Fundus glands are found in the fundus and body of the stomach ; each has one or more tubules lined by short columnar cells termed chief or central cells. At intervals between these cells and the basement membrane are larger spheroidal cells called parietal or oxyntic cells. The cells lining the necks of the fundus glands, although apparently similar in appearance to those in the bodies of the tubules, are physiologically different; they secrete mucus, (c) Pyloric glands, in the pyloric part of the stomach, are characterized by short ducts draining groups of short but tortuous gland tubules.