Feb 20 2009
Structure of the Kidney
The kidneys are lined by a fibrous capsule and consists of different types of structures: the cortical substance, immediately beneath the fibrous capsule and the medullary area. The cortical substance, dark red, surrounds the core substance that penetrates deeply into her training leading to a radio call pyramids medullary ray or Ferrein Ludwig.
The medullary substance, of lighter color, is comprised of 8-14 mass pyramid, Malpighian pyramids whose apex is opened in cavities in the form of glass called renal calyces converge in the ureter. Between the Malpighian pyramids are some extensions of the substance which are called cortical columns of Bertin.
The kidneys contain numerous microscopic tangles of blood capillaries, the glomeruli. Each receives blood from an afferent arteriole and efferent arteriole poured into another of smaller size. Both arterioles are contiguous and constitute a kind of stem vascular support. The glomerulus is surrounded by a double membrane, the Bowman capsule, which is replicated at the site where the afferent and efferent arterioles. On the opposite end, the membrane of the Bowman capsule by a thin continuous tube winding course, the renal tubule. The joint capsule of glomerulus and Bowman called Malpighian corpuscle.
The renal tubule emerging from the capsule of Bowman, called in its portion closest to the glomerulus proximal tubule, extends into a long winding tube (proximal tubule winding) which follows a U-shaped segment, the loop of Henle. Finally, the loop of Henle, is sinuous distal tubule that empties into a collecting tubule. The urine formed in the nephron is reflected in the collecting tubules, which represent the conduits that lead in the distal tubules winding. Collecting tubules are coming together with each other at different levels becoming higher caliber action that enters the spinal area. Ending in large ducts (Bellini ducts) that open directly into the renal calyces.