. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CETACEA. 579 really is, on account of its deep position and the overlapping of the kidney, E. As it gets beyond this part it is seen to dilate. Two veins, corresponding to the vena iliacee of Quadrupeds, (m, in,) return the blood in part to the tail, and join the vena cava near the kidneys. The vein corresponding to the caudal or sacro-median of Quadrupeds is not a simple vessel, but a plexus, which is surrounded and protected by the inferior spinous processes ; it is seen at_/'. A venous plexus from the intestinal canal
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CETACEA. 579 really is, on account of its deep position and the overlapping of the kidney, E. As it gets beyond this part it is seen to dilate. Two veins, corresponding to the vena iliacee of Quadrupeds, (m, in,) return the blood in part to the tail, and join the vena cava near the kidneys. The vein corresponding to the caudal or sacro-median of Quadrupeds is not a simple vessel, but a plexus, which is surrounded and protected by the inferior spinous processes ; it is seen at_/'. A venous plexus from the intestinal canal (g) terminates in the right iliac vein, which is larger than the left, and thus establishes a com- munication between it and the portal system. h shows a muscular vein, and i the termination of a hypogastric plexus. The more important plexuses which commu- nicate with the iliac veins are, first, the perito- neal plexus (/), which in older individuals, and especially at the season of sexual excitement, is much more considerable than is here repre- sented ; and secondly, the iliac or psoadic plexus (k,k), which forms an immense reser- voir of venous blood. It is situated between the under surface of the depressors of the tail, which represent the psoas muscles, and the peritoneum, reaching from behind the lower extremity of the kidney to the posterior end of the abdomen, and forming a mass of closely interwoven veins, of an inch or more in thick- ness, and serving to bring the subcutaneous veins of the posterior part of the body into communication with the posterior vena cava. This plexus is fed, if we may use the ex- pression, by «, an inferior vein; b, a lateral; and r, a superior vein of the tail, which unite to form an ischiadic sub-plexus, d. Laterally the iliac plexus receives from five to seven veins, which return the blood from the dorsal and lateral parietes of the abdomen, and pierce the lateral abdominal muscles to join the plexus at e, e. On its internal or mesial
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