. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 220 COMPARATIVE PHYSIOLOGY. cut anywhere gives rise to a flow of Ulood, owing to sec- tion of some of these tubes, which, it will be remembered, are not visible to the unaided eye. It is estimated that their united area is several hun- dred (500 to 800) times that of the arteries. If we suppose the epithe- lial lining pushed out of a small artery we have, so far as structure alone goes, a good idea of a capUlary—i. e., its walls are but one cell thick, and these
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 220 COMPARATIVE PHYSIOLOGY. cut anywhere gives rise to a flow of Ulood, owing to sec- tion of some of these tubes, which, it will be remembered, are not visible to the unaided eye. It is estimated that their united area is several hun- dred (500 to 800) times that of the arteries. If we suppose the epithe- lial lining pushed out of a small artery we have, so far as structure alone goes, a good idea of a capUlary—i. e., its walls are but one cell thick, and these cells though long are extremely thin, so that it is quite easy to under- stand how it is that the amoe- boid corpuscles can, under certain circumstances, push their way through its proba- bly semi-fluid walls. From what has been said, it will be seen that the whole collection of vascular tubes may be compared to two inverted funnels or cones with the. Fig. 189.—Various layers of the walls of a small artery (Landois). e, endothelium; i. e, internal elastic lamina; 9. m, circu- lar muscular fibers of the middle coat; e. t, connective tissue of the outer coat, or T. 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, Appleton
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