Outlines of human physiology . them in aproper direction, and the valve will be seen to close in 68 Of the Semilunar Valves. the manner represented. Fig. 3 is a diagram, givinganother view of the mitral valve when closed. Thetricuspid valve acts upon exactly the same principle. The valves at the root of the aorta and of the pul-monary artery are of a different description; they con-sist of three semilunar folds of the inner membrane, at-tached by their convex margin, each along a third ofthe circumference of the artery. They are so disposed,that when blood issues from the ventricle, they areth
Outlines of human physiology . them in aproper direction, and the valve will be seen to close in 68 Of the Semilunar Valves. the manner represented. Fig. 3 is a diagram, givinganother view of the mitral valve when closed. Thetricuspid valve acts upon exactly the same principle. The valves at the root of the aorta and of the pul-monary artery are of a different description; they con-sist of three semilunar folds of the inner membrane, at-tached by their convex margin, each along a third ofthe circumference of the artery. They are so disposed,that when blood issues from the ventricle, they arethrown up, and lie in contact with the parietes of theartery: but upon the reflux of the blood towards theheart, they are thrown down and sacculated, whiletheir floating margins, the centre of each of which isstrengthened by a sesamoid body, meet as tense chords,describing three radii of the circular aperture of thevessel. These valves are termed the sigmoidal or se-milunar valves of the aorta and pulmonary artery. ^ c%^5r >/. ^
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