The laws and mechanics of circulation, with the principle involved in animal movement . time, itis made more effective upon the faecal matter, the rectum, ofcourse, contracting simultaneously for increasing the action,while the levator ani are in concert so as to obviate strain tothe perineum, the parts being fully coordinated. The manner Nature has solved this difficult problem inmechanics, which is truly wonderful, must be set down to 812 OFFICE (»F THE LEVATOKES ANT. necessity, and as a prerequisite to the erect position, graduallybrought about in connection with the other changes in thepel
The laws and mechanics of circulation, with the principle involved in animal movement . time, itis made more effective upon the faecal matter, the rectum, ofcourse, contracting simultaneously for increasing the action,while the levator ani are in concert so as to obviate strain tothe perineum, the parts being fully coordinated. The manner Nature has solved this difficult problem inmechanics, which is truly wonderful, must be set down to 812 OFFICE (»F THE LEVATOKES ANT. necessity, and as a prerequisite to the erect position, graduallybrought about in connection with the other changes in thepelvic framework. The following illustration (Fig. 126) will show the arrange-ment and distribution of the spinal nerves to the chest andwalls of the abdomen. As will be seen, the nerves to theabdominal walls are nearly all intercostals, so called, save theilio-hypogaster (1G) or first lumbar nerve, to the inguinalregions, but in the abdomen the intercostals are greatlyenlarged in correspondence with the amount of muscles forevolving the force in the walls in connection with respira-. Fig. 125.—Muscles of the Perineum.—Wilson and Buchanan. tion and the functions in the viscera. And one may readilyperceive how the action in the abdomen may be made toalternate with the action in the diaphragm in respiration,since the phrenic nerves are correlated with them in therespiratory centre; as also how the viscera are broughtinto correspondence with the walls through the reflex actionsset up by means of the pneumogastric and splanchnic nerves,correlated with the intercostal and phrenic nerves. Finally,how sensory impressions in the pelvic viscera should con-centrate the force in the pelvic excavation, in connectionwith the special functions in these organs, while the enormousweb of nerves and nervous ganglia in the hypogastric plexus(Fig. 116), together with the nerves running into it and thespecial viscera from the spinal axis, notably from the fifthlumbar and sacral nerves (Ibid), wou
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