Figure 20-2 Photomicrograph of a cast of a glomerulus without Bowman's capsule. At the lower left, the afferent arteriole (A) originates from an interlobular artery and enters the glomerulus with its many capillary loops. At the upper left, the efferent arteriole (E) leaves the glomerulus and branches to form the peritubular capillary plexus (magnification ×300). (From Tisher CC, Madsen KM: Anatomy of the kidney. In Brenner BM [ed]: Brenner & Rector's The Kidney, 6th ed. Philadelphia, WB Saunders, 2000, pp 3–67.)