. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. Fig. 14. Frog support for studying the circulation in A the tongue, B the mesentery, and C the web of the foot. The foregoing offer different aspects of the subject for study. The web being covered by skin, the pigment and guanin cells, sometimes very numerous, may interfere considerably with a clear view of the vascular structures beneath. Capillaries are numerous. The mesentery being very thin shows the larger vessels well, but there are few capillaries. The tongue exh
. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. Fig. 14. Frog support for studying the circulation in A the tongue, B the mesentery, and C the web of the foot. The foregoing offer different aspects of the subject for study. The web being covered by skin, the pigment and guanin cells, sometimes very numerous, may interfere considerably with a clear view of the vascular structures beneath. Capillaries are numerous. The mesentery being very thin shows the larger vessels well, but there are few capillaries. The tongue exhibits large tortuous (Lingual) arteries in which the expan- sion at the ventricular systole is particularly well seen. Circulation in the web. Search (L) for an artery, the blood stream runs in it from the trunk into the branches; find a vein, in it the streams converge into the trunk. Note the relative difference in the rate of flow and in the diameter of the two vessels. Trace the blood stream from the artery into the vein through the capillaries. (H) Study the flow in the latter. In these the blood cells are individually visible, the red ones bending to the curves around which they travel; occasionally a red cell is caught on the edge of bifurcation of a vessel it then becomes flexed and responds to each systole, recovering its 1 In this organ living muscle and nerves can be observed. When thus extended striped muscular fibres may be readily fixed and isolated as follows:— Drop absolute alcohol upon the mucosa until bleached, scrape through it in the direction of the bands of muscle until the latter are exposed, and let the alcohol act upon them until they lose their elasticity. Remove portions and immerse them in absolute alcohol for twenty minutes. Separate by teasing and after bathing with water stain them with hematoxylin and mount in balsam. Small nerve bundles accompany the blood vessels, the outlines of the fibres are sharply denned, and the double contour of the me
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
