Each renal artery branches into segmental arteries, dividing further into interlobar arteries, which penetrate the renal capsule and extend through the renal columns between the renal pyramids.
2.
Distinctive features of the mammalian kidney, in comparison with that of other vertebrates, include the presence of the renal pelvis and renal pyramids, and of a clearly distinguishable cortex and medulla.
3.
So the renal pyramid, for example, is redder at the base, whiter at the tip, as it gets more and more large tubules packed together, with a loose interstitial material.
4.
They run outward in a straight course between the tubes of the medullary substance, and joining, as above stated, the interlobular veins, form venous arcades; these in turn unite and form veins which pass along the sides of the renal pyramids.
5.
Grossly, these structures take the shape of eight to 18 cone-shaped renal lobes, each containing renal cortex surrounding a portion of medulla called a renal pyramid ( of medullary ray is a collection of renal tubules that drain into a single collecting duct.
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