An American text-book of physiology . 88. CIRCULA TION. 403 mitral, not only in the complete distinctness of their segments, but also intheir mechanism. The tendinous cords are wholly luckinus and each segmentdepends upon its direct connection with the arterial wall to prevent reversalinto the ventricle during the diastole of the latter. If the artery he carefullylaid open by cutting exactly between two of the segments, each of the three isseen to have the form of a pocket with its opening turned away from the heart(see Fig. 103). Behind each segment, the artery is dilated into one of the
An American text-book of physiology . 88. CIRCULA TION. 403 mitral, not only in the complete distinctness of their segments, but also intheir mechanism. The tendinous cords are wholly luckinus and each segmentdepends upon its direct connection with the arterial wall to prevent reversalinto the ventricle during the diastole of the latter. If the artery he carefullylaid open by cutting exactly between two of the segments, each of the three isseen to have the form of a pocket with its opening turned away from the heart(see Fig. 103). Behind each segment, the artery is dilated into one of the hol-lows or sinuses of Valsalva.^ As the valve lies immediately above thebase of the ventricle the segments rest upon the top of the thick muscularwall of the latter, which atfords them a powerful support (see Fig. 104).Each segment is attached by the whole length of its longer edge to the artery,while the free margin is formed by the shorter edge. It is this arrangementwhich renders reversal of a segment impossible (see Fig. 103)..
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