. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ibound in it« th oocarional le iIeo-c8Boal «ntly mostly mal stimula- however, the 'es is so great the normal in one in the !t vigorously. charged with e centers pre- he intestinal y clear, but it result The emento of the everse effect; movements of »unusual fear le movements isiderable im- formally they • from the ali- both smooth take part, isciousness of t of the will; . Agains
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ibound in it« th oocarional le iIeo-c8Boal «ntly mostly mal stimula- however, the 'es is so great the normal in one in the !t vigorously. charged with e centers pre- he intestinal y clear, but it result The emento of the everse effect; movements of »unusual fear le movements isiderable im- formally they • from the ali- both smooth take part, isciousness of t of the will; . Against ac- n the sphinc- )r part of the ag able, by an phincteror to pbably almost all events any made to take 1 whether the f volition it is DIGESTION OF FOOD. 389 What happens during an ordinary act of defecation is about as follows : After a long inspiration the glottis is closed ; the diaphragm, which has descended, remains low, atfording, with tLe obstructed laryngeal outlet, a firm basis of support for the action of the abdominal muscles, wliich, bearing on the intes- tine, forces on their contents, which, bdore the act hus been oalle^ for, have been lodged mostly in the large intestine ; at the same time the sphincter ani is relaxed and peristaltic move- ments accompany and in some instances precede the action of the abdominal muscles. The latter may contract vigorously on a full gut without success in the a'>»«nce of the intestinal peri- stalsis, as too many oases of obstinate constipation bear witness. Like deglutition, and unlike vomiting, there is usually both a voluntary and involuntary part to the act Though the will, through the cerebrum, can inhibit defeca- tion, it is likely that it does so through the influence of the cerebrum on some center in the cord; for in a dog, the lumbar cord of which has been divided from the dorsal, the act is, like micturition, erection of the penis, and others which are under the control of the will, still possible, though,
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