Types and market classes of live stock . sawdust, so that the saw-dust fills up loosely the spaces between the individual grapesand the branches of the stem, we may develop our comparisonfurther; the sawdust stands for the connective tissue in whichthe ducts and alveoli are embedded, and the basket stands forthe capsule Types and Market Classes of Live Stock 159 The arterial circulation.—The mammary glands are abun-dantly supplied with blood. The blood leaves the heart throughthe posterior aorta, common iliacs, and external iliac, whichcarry backward to the region of the hips. The external ili
Types and market classes of live stock . sawdust, so that the saw-dust fills up loosely the spaces between the individual grapesand the branches of the stem, we may develop our comparisonfurther; the sawdust stands for the connective tissue in whichthe ducts and alveoli are embedded, and the basket stands forthe capsule Types and Market Classes of Live Stock 159 The arterial circulation.—The mammary glands are abun-dantly supplied with blood. The blood leaves the heart throughthe posterior aorta, common iliacs, and external iliac, whichcarry backward to the region of the hips. The external iliacthere divides into two arteries, one of which, the prepubic, dividesinto the two pudic arteries, the external one of which passesdown the thigh and gives off a branch, known as the mammaryartery, which enters the top of the udder from the rear. Themammary artery has four large branches, one for each quarterof the udder, and there is also a small branch for each rudi-mentary gland. The large branches subdivide within thegland Fig. 49. Circulation To and From tiie Udder. The broken lines represent the arteries which carry blood containing thenutritive material to the udder where it is manufactured into milk. Theheavy black lines represent the veins which carry the blood back to the that there is but one route from the heart to the udder, whereas thereare two routes from the udder to the heart. M. V., milk-vein; M. W., milk-well. (After Bitting of the Indiana Station.) The venous circulation is more complex than the blood is collected from the capillaries by from 14 to 17large veins which empty into the mammary vein running parallelwith the mammary artery at the top of the udder. The mam-mary vein is divided into two parts which encircle the top ofthe udder and connect in front and behind like a rope tied aroundit. From this circuit of veins the blood returns to the heart bytwo routes. One route leads out to the rear of the udder, then 160 Type
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlivesto, bookyear1919
