. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 830 COMPARATIVE PHYSIOLOGY. as the stomach itself and the gaWet, take part Probably as a result of the descent of the diaphragm and consequent diminu- tion of the intrathoracic pressure, the ascent of the cud is as- sisted by an aspiratory process. The returning food is pre- vented from passing into the nasal chambers by co-ordinated movements analogous to those of swallowing. Th
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 830 COMPARATIVE PHYSIOLOGY. as the stomach itself and the gaWet, take part Probably as a result of the descent of the diaphragm and consequent diminu- tion of the intrathoracic pressure, the ascent of the cud is as- sisted by an aspiratory process. The returning food is pre- vented from passing into the nasal chambers by co-ordinated movements analogous to those of swallowing. The whole pro- cess is reflex in the same sense as is deglutition. Normally the rumen always contains considerable liquid, a portion of which passes up with the cud, but is in great part returned it once. A ruminant given dry food without water can not return the cud. In the second mastication the process is in most ruminants unilateral; and as hundreds of cuds are to be chewed, a cbn- piderable proportion of the whole day is occupied with rumina- tion. When a single cud is sufficiently masticated it is swallowed,. Fio. 878.—Stonuwh of dog {after Ctiav«i>n). A, aeaophagni; B, pylorus. and being finely comminuted passes at once through the small opening between the reticulum and manyplies into the third stomach, and thence into the abomasum, though possibly on the way a little may pass into the first two stomachs. PathologiflaL—While moderate fullness of the paunch is. 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 original Mills, Wesley, 1847-1915. New York : D. Appleton; London : Caxton House
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