The laws and mechanics of circulation, with the principle involved in animal movement . heart, which is still more developed, is at the baseof these (Fig. 16J, n, o), in a cavity between the great adduc-tor muscle (I, m) and the folds of intestine. It possesses atrue pericardium, and consists, in the species under considera-tion, of two distinct chambers—an auricle and ventricle. Theauricle (163, b) is large, and the walls extremely thin, thedelicate muscular fasciculi and transparent membranes per-mitting the blood to be seen through them. It receives theblood from th°s branchiae by two large
The laws and mechanics of circulation, with the principle involved in animal movement . heart, which is still more developed, is at the baseof these (Fig. 16J, n, o), in a cavity between the great adduc-tor muscle (I, m) and the folds of intestine. It possesses atrue pericardium, and consists, in the species under considera-tion, of two distinct chambers—an auricle and ventricle. Theauricle (163, b) is large, and the walls extremely thin, thedelicate muscular fasciculi and transparent membranes per-mitting the blood to be seen through them. It receives theblood from th°s branchiae by two large venous trunks, in whichthe branchial veins converge (e, g, 7i), and transmits it to theventricle (d) through two intermediate canals (c), whence it ispropelled through the body by the arterial vessels {n, o, p),a vessel of considerable size, passing at once in the ad-ductor muscle for producing the force which is expended inoperating the valves. The veins pass directly into thebranchiae (m, n, i,f) without the intervention of a sinus, the POSITION OF THE HEAET IN THE OYSTEE. 397. Fig. 162.—Alimentary Canal of the Oyster (Ostrea edulis).—Jones, a, The stomachlaid open ; d, the liver ; b, c, d, f, convolutions of the intestine ; gr, anal aperture ;n, o, auricle and ventricle of the heart; I, m, adductor muscle ; h, k, lobes of themantle, divided to show the large venous canals at the base of the branchiae.
Size: 1543px × 1619px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
