Congenital Anomalies, Cystic Diseases of the Kidney and Hereditary Nephritis- Dr. Trif (Final Exam)
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What are the 3 sequential developmental phases to form the urogenital system?
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1) Pronephros: arises at 3 wks as segmental collections of mesoderm in the cervical region. Attached to paired pronephric ducts. It is nonfunctional in humans and undergoes regression at 4 wks.
2) Mesonephros: begins to develop as pronephros degenerates. Consists of glomeruli and mesonephric tubules which open into paired mesonephric (Wolffian) ducts, which are continuations of the pronephric ducts. It forms elongated interim kidneys that produce little, if any, urine in humans and undergoes regression at 5 weeks.
3) Metanephros: the permanent kidneys begin to develop as the mesanephros degenerates. Result from interaction b/w ureteric bud, a diverticulum from the mesonephric duct, and the metanephric mesenchyme (metanephric blastema). The collecting tubules, collecting ducts, calyces, renal pelvis and the ureter are all derived from ureteric bud. The collecting tubules induce the surrounding mesenchyme to grow and become tubules that form parts of the nephron: glomerulus, Bowman's capsule, convoluted tubules and the loop of Henle.
2) Mesonephros: begins to develop as pronephros degenerates. Consists of glomeruli and mesonephric tubules which open into paired mesonephric (Wolffian) ducts, which are continuations of the pronephric ducts. It forms elongated interim kidneys that produce little, if any, urine in humans and undergoes regression at 5 weeks.
3) Metanephros: the permanent kidneys begin to develop as the mesanephros degenerates. Result from interaction b/w ureteric bud, a diverticulum from the mesonephric duct, and the metanephric mesenchyme (metanephric blastema). The collecting tubules, collecting ducts, calyces, renal pelvis and the ureter are all derived from ureteric bud. The collecting tubules induce the surrounding mesenchyme to grow and become tubules that form parts of the nephron: glomerulus, Bowman's capsule, convoluted tubules and the loop of Henle.

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