The laws and mechanics of circulation, with the principle involved in animal movement . es and locomotive organs in largevenous sinuses at the bases of the branchiae (a, a) thence by aspecial vessel (e, e) analagous to the pulmonary artery tothe branchiae (one for each gill), to be distributed over * The intestine is pulled aside in order to exhibit these vessels. 392 SHOWING POSITION OF THE HEART IN DECAPODS. the innumerable minute laminse of the gills, whence it is re-collected by the branchial veins (/, /), and transmitted to theheart (g). The branchial arteries follow the outer margin, and
The laws and mechanics of circulation, with the principle involved in animal movement . es and locomotive organs in largevenous sinuses at the bases of the branchiae (a, a) thence by aspecial vessel (e, e) analagous to the pulmonary artery tothe branchiae (one for each gill), to be distributed over * The intestine is pulled aside in order to exhibit these vessels. 392 SHOWING POSITION OF THE HEART IN DECAPODS. the innumerable minute laminse of the gills, whence it is re-collected by the branchial veins (/, /), and transmitted to theheart (g). The branchial arteries follow the outer margin, andthe returning veins the inner margin of the gills, and the unitedtrunks of the latter vessels convey the arterialized blood, by asingle orifice on each side, into the large median muscularventricle (g). As in other articulata, it is situate in themiddle of the back, as seen in the lobster (Fig. 161, c),and consists of a single systemic muscular cavity, most con-centrated in form in the decapods, and generally elongated onthe inferior orders; its thick parietes are composed of inter-. Fig. 160.—Showing Relation of the Heart to the Gills in Decapods, Maja Squinado.—Grant, a, a, Capacious lateral sinuses at the bases of the branchiae ; b, inferiorabdominal veins ; c, superior abdominal veins ; e, e, branchial arteries originatingfrom these wide sinuses : /, /, branchial veins ; g, the large median muscular ventri-cle ; i, i, h, anterior arterial branches ; k, the great posterior median systemicartery. laced muscular fibres, they present internal fleshy columns,there are semilunar valves at the orifices of the great vessels,and the heart is connected, as usual, with the neighboringparts by muscular bands. From the anterior and upper mar-gin of the heart arise three arterial trunks (/, /, h), the twolateral of which send branches to the genital organs and thestomach, and terminate in the two antennal arteries, proceed-ing to the outer and inner pair of these organs, and the medi
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
