The laws and mechanics of circulation, with the principle involved in animal movement . upon the contents, as in thecase of the rectum, bladder and womb, producing a reverseperistalsis, since this would assist the action ; for Nature con-centrates all her available force in expulsive efforts Theshort, loud inspiratory sound characteristic of vomiting isproduced by energetic inspiration suddenly arrested by thestronger action in the abdominal muscles. The above illus-trations will serve for impressing the matter (Figs. 127, 128). TBE ACTION IN EMESIS. 315 Thus the mesentery is forcibly compress
The laws and mechanics of circulation, with the principle involved in animal movement . upon the contents, as in thecase of the rectum, bladder and womb, producing a reverseperistalsis, since this would assist the action ; for Nature con-centrates all her available force in expulsive efforts Theshort, loud inspiratory sound characteristic of vomiting isproduced by energetic inspiration suddenly arrested by thestronger action in the abdominal muscles. The above illus-trations will serve for impressing the matter (Figs. 127, 128). TBE ACTION IN EMESIS. 315 Thus the mesentery is forcibly compressed against thestomach under the energetic action of the muscles in theabdomen, the contracted diaphragm being the point of re-sistance, since both act in concert; while the correlation ofthe pneamogastric, phrenic, and intercostal nerves in the me-dulla oblongata enables this concert of action in the stomach,diaphragm, and the muscles in the abdomen to be irritation is propagated from sensory impressions in thegastric mucous membrane, which sets up the action in the me-. Fig. 129.—Transverse Section of the Muscles in the Abdominal Walls.—Gray. dulla whence it is reflected over the structures. It is all verysimple and easily understood. The extreme pressure upon theliver and gall-bladder would also account for the escape of thebile. The above instructive diagram (Fig. 129) will show therelative position of the muscles in the abdominal walls andthe manner the recti abdominis are kept in position by thestrong fibrous aponeuroses. In the quadruped the weight ofthe viscera is largely sustained by these powerful muscularbeams; at the same time, their aid is readily invoked for assist-ing in flexing the spine at the lumbar vertebrae, for which thereis frequent occasion in connection with the functions in thepelvic viscera, as before remarked. In man, still more fre-quently for effecting the bending and stooping posture. CHAPTER XIV. CIRCULATION IN THE EMBRYO, MECHANIC
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