The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . nd which they are found, and differ from the venous sinusesin being more capacious, a section of the sinus and its segment(which is likewise very ample) giving a sweep of nearly half a a result of this amplitude, those portions of the segments whichproject into the vessel are, during the action of the valve, closelyapplied to each, other throughout a
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . nd which they are found, and differ from the venous sinusesin being more capacious, a section of the sinus and its segment(which is likewise very ample) giving a sweep of nearly half a a result of this amplitude, those portions of the segments whichproject into the vessel are, during the action of the valve, closelyapplied to each, other throughout a considerable part of their extent(Fig. 133, c, b ; d, a, b, c) ; the great size of the sinuses furnishingan increased quantity of blood for pressing the segments from abovedownwards, and from without inwards, or in the direction of theaxis of the vessel. The sinuses of Valsalva curve towards eachother in a spiral direction; and this ought to be attended to inspeaking of the action of the semilunar valves, -as the sinusesdirect the blood spirally on the mesial line of each segment (, d, v, w, x), and cause the segments to twist and wedge into eachother, as shown at r s t, v w x, of Fig. 134. In order to determine Fig. Fio. 134.—Base of heart, with right and left ventricles removed to show the pulmonic,aortic, and mitral valves. The pulmonic and aortic valves (r s t, v w x) have been closed bypouring liquid plaster of Paris into them. The mitral valve (c) is open, it always happeningthat when the semilunar valves are closed, the auricular-ventricular ones are open. The seg-ments of the pulmonic and aortic valves (vide arrows r s t, v w x) are spirally wedged intoeach other, a, />, Right and left musculi papillares of left ventricle, c, Aortic segment ofmitral valve. From photograph.— Original. this point, I procured a fresh pulmonary artery and aorta, and, afterputting the valves in position with water, caused an assistant todrop liquid plaster of Paris into
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectblo, booksubjectblood
