Outlines of human physiology; designed for the use of the higher classes in common schools . rstis the mucous coat which lines it: this coat contains agreat nnmber of small glands, by which not only theordinary mucus is secreted, but which are supposed tofurnish the gastric juice, a very important agent in di-gestion. Immediately under the mucous coat, numer-ous muscular fibres are found, some of which run in alongitudinal direction, and others in a transverse; andthese form the muscular coat. Exterior to this is theserous coat, forming a smooth and highly polishedcovering. The stomach is abun
Outlines of human physiology; designed for the use of the higher classes in common schools . rstis the mucous coat which lines it: this coat contains agreat nnmber of small glands, by which not only theordinary mucus is secreted, but which are supposed tofurnish the gastric juice, a very important agent in di-gestion. Immediately under the mucous coat, numer-ous muscular fibres are found, some of which run in alongitudinal direction, and others in a transverse; andthese form the muscular coat. Exterior to this is theserous coat, forming a smooth and highly polishedcovering. The stomach is abundantly supplied with blood-ves-sels and nerves,—an evidence of the important part it isdesigned to perform in the vital functions. Its nervesare derived from a variety of sources; some from whatare called the ganglions; others from the spinal marrow,and what is still more remarkable, a pair is sent fromthe brain itself. At the pyloric orifice of the stomach, there is a 32 DIGESTION. membranous fold, which acts something like a valve,and which is supposed to be capable of preventing the. The Stomach, a CEsophagus. b Cardiac portion,c Great or Jeft extremity, d Small extiemity, eStomach, tied at the pylorus. / Great anteriorcurvature, g Omentum or caul. exit of its contents till they have been sufficiently actedupon, for the purposes of digestion. The intestines in the human subject are usuallyfrom six to eight times as long as the individual towhom they belong. They are divided into small andlarge intestines, the former constituting about four-fifthsof the whole. The small intestines are divided into theduodenum, the jejunum, and the ileum. The duodenumis so called from its length being about equal to twelvefingers in breadth. It is somewhat larger than the othertwo. The ducts from the pancreas and fiver enter into it,usually at about one-third of the distance between the DIGESTION. 33 Stomach and the jejunum. Sometimes they enter sep-arately and sometimes by a common opening.
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