The reniculus of the sei whale (Balaenoptera borealis)

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Abstract
For the first time the histological structure of the reniculus of the sei whale (Balaenoptera borealis) is described, with special reference to its vasculature and to the constitution of its well-developed sporta. Renicular venous return is principally effected through a peripheral plexus whence relatively large interrenicular veins drain into the vv. reniculares, or, possibly, into the v. renalis as direct radicles. The material examined affords no evidence as to the occurrence of veins ‘wandering’ from the kidney surface directly to renal vein or postcava: the presence of such veins is not, however, thereby excluded. In its general structure the sei whale reniculus is essentially similar to the reniculus of other balaenopterids examined, though its sporta is relatively better developed.

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