Blood flows directly from interlobular arteries into arcuate arteries. Blood flows directly from the vasa recta into afferent arterioles. Blood flows directly from efferent arterioles into afferent arterioles. Blood flows directly from the peritubular capillary plexus into arcuate arteries. A. See the diagram.
Medullary pyramids reflect the lobulation of the kidney.
Thin segments of the loop of Henle are characteristically found in medullary rays. Juxtamedullary nephrons with long thin limbs in their loops of Henle are important for the production of hypertonic urine. The continuous epithelium of Bowman's capsule includes podocytes of the visceral layer and the simple squamous epithelial cells of the parietal layer. Reabsorption of water is driven by the sodium-potassium ATPase in cells of the proximal convoluted tubule. Fenestrated endothelial cells of the glomerulus.