Diagram of the Structure of the Kidney
A diagram of the structure of the kidney. Labels: 1, Tubules or minute tubes. 2, Enlargement of a tubule at its extremity. 3, Branches of the real artery ending in vessels which enter the enlargements as seen at 4, 5. 6, Knot of blood-vessels freed from its investment. 7, Veins emerging from the knots. 8, Plexus formed by the latter veins among the tubules, from which plexus originate the branches of the renal vein.