. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 2QO COMPARATIVE MORPHOLOGY OF VERTEBRATES. In the fishes the vessels of the appendages are but slightly developed, there, being a subclavian vein entering the Cuvierian duct, and occa- sionally a brachial vein which may empty into the sinus venosus. In the amphibia a cutaneus magnus vein (fig. 302), coming from the skin of the trunk, may enter the subclavian, while in all tetrapoda the subclavian, after leaving the limb, receives a superficial cephalic and an axillary vein, the latter changing its name in the a
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 2QO COMPARATIVE MORPHOLOGY OF VERTEBRATES. In the fishes the vessels of the appendages are but slightly developed, there, being a subclavian vein entering the Cuvierian duct, and occa- sionally a brachial vein which may empty into the sinus venosus. In the amphibia a cutaneus magnus vein (fig. 302), coming from the skin of the trunk, may enter the subclavian, while in all tetrapoda the subclavian, after leaving the limb, receives a superficial cephalic and an axillary vein, the latter changing its name in the appendage to the. FIG. 294.—Relations and modifications of the post- and subcardinal, abdominal and postcaval veins in different stages ot the amphibia. In A the veins (z7) from the hind limb return directly to the heart by the lateral abdominal veins (la), while the blood from the tail (c) passes by way of the subcardinals (sc) through the mesonephroi to the postcardinals (pc). In B the lateral abdominals have united in front to form the anterior abdominal vein (aa); the iliacs have sent a branch to the postcardinals, which have grown back to join the caudals, while the subcardinals have lost their connexion with the caudal and have acquired one with the postcava (p), a backward growth from the sinus venosus. In C the postcardinals have been interrupted, the posterior half of each now forming an advehent vein while the subcardinals, as in B, form the revehent veins (r). brachial vein. In the hind limb the common iliac vein is formed by the union of the femoral and sciatic (ischiadic) veins, as well as the hypogastric (internal iliac) vein already referred to. In the classes above fishes (dipnoi, amphibia and amniotes) a new vein, the postcava (vena cava inferior) appears. This arises in part from scattered spaces, in part as a diverticulum of the sinus venosus and the hepatic veins, and grows backward, dorsal to the liver, until it meets and fuses with the right subcardinal v
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
