. Human physiology. - above thern theartery bulges out, forming three sacculi or sinuses, called sinuses of Val-salva. These are often said to be partly formed by the pressure of theblood upon the sides of the vessel. The structure is doubtless ordained,and is admirably adapted for a specific purpose,—namely, to allow thefree edges of the valves to be readily caught by the refluent blood, andthus facilitate their closure. Within the right ventricle, and especially Fig. Sections of Aorta, to show the action of the Semilunar Valves. A. The valves, represented by the dotted lines, in contact
. Human physiology. - above thern theartery bulges out, forming three sacculi or sinuses, called sinuses of Val-salva. These are often said to be partly formed by the pressure of theblood upon the sides of the vessel. The structure is doubtless ordained,and is admirably adapted for a specific purpose,—namely, to allow thefree edges of the valves to be readily caught by the refluent blood, andthus facilitate their closure. Within the right ventricle, and especially Fig. Sections of Aorta, to show the action of the Semilunar Valves. A. The valves, represented by the dotted lines, in contact with the arterial walls, represented by thecontinuous outer line. b. The arterial wall distended into three pouches (a), and drawn away from thevalves, which are straightened into the form of an equilateral triangle, as represented by tlie dotted The margins of the valves when in action:—a. Tlie pouches between the valves and the arterial The apposed edges, c. The apposed surfaces of the valves, d. Mouths of coronary arteries, e. Cutedge of aorta. towards the apex of the heart, many strong eminences are seen, columncecarnece (Fig. 93), These run in different directions, but the strongestof them longitudinally with respect to the ventricle. They are of va-rious sizes, and form a beautifully reticulated texture. Their chief useprobably is, to strengthen the ventricle, and prevent it from beingover-distended; in addition to which they may tend to mi
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Keywords: ., bookauthordungliso, bookcentury1800, bookdecade1850, bookyear1856
