. Comparative anatomy. Anatomy, Comparative. THE DIGESTIVE SYSTEM 309 greater curvature on the left side of the body and a lesser curvature to the right. The opening of the esophagus into the stomach is the cardiac orifice, that into the small intestine is the pylorus. The anterior more enlarged portion of the stomach is the cardiac portion, the posterior more constricted portion is the pyloric portion. In the cardiac division, may be distinguished a main body and a blind pouch, the fundus. The pyloric portion of the stomach diminishes in size towards the pylorus, which is reduced to a small a
. Comparative anatomy. Anatomy, Comparative. THE DIGESTIVE SYSTEM 309 greater curvature on the left side of the body and a lesser curvature to the right. The opening of the esophagus into the stomach is the cardiac orifice, that into the small intestine is the pylorus. The anterior more enlarged portion of the stomach is the cardiac portion, the posterior more constricted portion is the pyloric portion. In the cardiac division, may be distinguished a main body and a blind pouch, the fundus. The pyloric portion of the stomach diminishes in size towards the pylorus, which is reduced to a small aperture by a local ring-like thickening of the mucous lining and of the layer of circular. GREATER CURVATURE PYLORIC STOMACH Fig. 259.—The right half of the human stomach, viewed from within. Braus, after Elze.) (Redrawn from muscle. By this mechanism, only finely divided material is allowed to pass in jets into the duodenum, forced by the peristalsis of the stomach. The wall of the stomach contains the same four layers of tissue as are seen in the esophagus, plus an external serous layer. These beginning with the outermost are the serosa, including the adventitia, the tunica muscularis, tunica submucosa, and the tunica mucosa. The tunica serosa is a connective tissue layer covered with the peritoneal epithelium. In it are many blood vessels, with branches of the vagus nerve and the celiac plexus of sympathetic nerve fibers. The tunica muscularis contains three layers of muscle, longitudinal, circular, and obHque. By their combined action under the stimulus of the sympathetic nerves, the stomach maintains a peristaltic churning action as long as food is present. The tunica submucosa consists of loose areolar connective tissue richly supplied with blood vessels and with a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the or
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
