Human physiology (Volume 2) . ve towards thelungs, and convex towards the ventri-cle. Immediately above them the semilunar valves closed,artery bulges out, forming three sacculi or sinuses, called sinuses of Valsalva. These are often said to bepartly formed by the pressure of the blood upon the sides of thevessels. The structure is doubtless ordained, and is admirablyadapted for a specific purpose, namely, to allow the free edgesof the valves to be readily caught by the refluent blood, and thusto facilitate their closure. Within the right ventricle, and especi-ally towards the apex of the hear
Human physiology (Volume 2) . ve towards thelungs, and convex towards the ventri-cle. Immediately above them the semilunar valves closed,artery bulges out, forming three sacculi or sinuses, called sinuses of Valsalva. These are often said to bepartly formed by the pressure of the blood upon the sides of thevessels. The structure is doubtless ordained, and is admirablyadapted for a specific purpose, namely, to allow the free edgesof the valves to be readily caught by the refluent blood, and thusto facilitate their closure. Within the right ventricle, and especi-ally towards the apex of the heart, many strong eminences areseen, which are called columnx carnex (Fig. 156). These runin different directions, but the strongest of them longitudinallywith respect to the ventricle. They are of various sizes, and forma beautifully reticulated texture. Their chief use probably is, tostrengthen the ventricle and prevent it from being over-distended ;in addition to which they may tend to mix the different productsof 7Q CIRCULATION. The corporeal, left, aortic or systemic theheart of red blood,-has likewise an auricle and a ventricle, l neleft auricle is considerably thicker and stronger but sinalle thanthe right; and is likewise divided into sinusvenosus *™Pr°Ve™u™ocle, which form a common cavity. The columns in the latte> ratelike those of the right auricle, bat less distinct. From the underpart of the auricle, a circular passage, termed ostium artenosumor auricular orifice leads to the posterior part of the base or tnecavity of the left ventricle. The left auricle receives the bloodfrom the pulmonary veins. The left or aortic ventricle is situateat the posterior and left part of the heart. Its sides are three timesthicker and stronger than those of the right ventricle, to permit themuch greater force which it has to exert; for, whilst the rightventricle merely sends its blood to the lungs, the left ventricletransmits it to every part of
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
