BIOL 2P95 Lecture Notes - Lecture 10: Peritoneum, Abdominal Wall, Cloaca
4 Feb 2013
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Both systems have common components (processing, ducts, storage, excretion: urinary system, pronephros, mesonephros ridges) Most cranial, nonfunctional, and regresses by end of 4th week. Nephrotomes develop into functional mesonephric units (bulges give ug. Mesonephric units contain mesonephric tubules (connected to developing mesonephric duct) and bowman"s capsule (surrounding glomerulus) Initially, mesonephric kidney empties into intraembryonic cavity, but after mesonephric duct forms it empties into cloaca. Mesonephros regresses by 3rd month, leaving behind mesonephric duct: metanephros, collecting system metanephric duct. Ureteric bud arises from mesonephric duct, and becomes. Successive bifurcations gives rise to renal pelvis, major and minor calyces, and collecting tubules (of renal pyramids: excretory system. Renal vesicles give rise to renal tubules, which establish connection with collecting tubule and give rise to middle part of nephron. Remember, urine passes through mesonephric duct on way to: the kidney ascends in the abdomen during development, development of the bladder and urethra. Week 6-7, urorectal septum divides cloaca into anorectal canal and.
