. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . dpari of their walls removed to show their cavities(Allen Thomson). 1, right pulmonary vein cutshort; V, cavity of left auricle; 3, thick wall ofleft ventricle ; 4, portion of the same with pap-illary muscle attached ; 5, 5, the other papillarymuscles; 0, one segment of the mitral valve; 7,in aorta is placed over the semilunar valves. THE CIRCULATION OF TI1E BLOOD. 217 It will be found very helpful to perform some of the dissec-tions under water, and by the use of this or some other fl
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . dpari of their walls removed to show their cavities(Allen Thomson). 1, right pulmonary vein cutshort; V, cavity of left auricle; 3, thick wall ofleft ventricle ; 4, portion of the same with pap-illary muscle attached ; 5, 5, the other papillarymuscles; 0, one segment of the mitral valve; 7,in aorta is placed over the semilunar valves. THE CIRCULATION OF TI1E BLOOD. 217 It will be found very helpful to perform some of the dissec-tions under water, and by the use of this or some other fluidthe action of the valves may be learned as it can in no otherway. By a little manipulation the heart may be so held thatwater may be poured into the orifices, prepared by a removalof a portion of the blood-vessels or the auricles, when the valvesmay be seen closing together, and thus revealing their action ina way which no verbal or pictorial representation can do at alladequately. A heart thoroughly boiled and allowed to get cold shows, onbeing pulled somewhat apart, the course, attachment, and other. ■It T^ JRAV Fio. of the orifices of the heart from below, the whole of the ventricleshaving been cut away (after Huxley). JRAV, right auriculo-ventricular orifice,surrounded bv the three flaps, t. v. 1, t. v. 2. t. v. 3, of the tricuspid valve, which arestretched by weights attached to the chorda tendinece. LAV. left auriculo-ven-tricular orifice, etc. PA. orifice of the pulmonary artery, the semilunar valvesrepresented as having met and closed together. A 0, orifice of the aorta. features of the fibers very well, as also the skeleton of the organ,which may be readily separated. When this has all been done, the half is not yet accom-plished. A visit to an abattoir will now repay amply for thetime spent. Animals are there killed and eviscerated so rapidlythat an observer may not only gain a good practical acquaint-ance with the relations of the heart to other p
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
