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22 Cards in this Set
- Front
- Back
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what does the urinary system mostly form from?
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intermediate mesoderm
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what parts of the urinary system develop from endoderm rather than intermediate mesoderm?
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most of bladder, urethra
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how many pairs of kidneys intially form and in what order?
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from cranially to caudally: pronephros, mesonephros, metanephros.
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what does the pronephros consist of?
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rudimentary kidney tubules and blood vessels: nephrotomes.
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what do nephrotomes contribute to?
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the mesonephric duct
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what form the bowman's capsule?
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mesonephric tubules
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what does the mesonephric duct empty into?
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cloaca
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where does the metanephros form?
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pelvic region
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what does the metanephros do?
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forms tubules similar to the mesonephric tubules.
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how does the ureter grow?
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ureteric bud grows out of the mesonephric duct to meet the metanephric blastema
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how does the ureteric bud form the renal pelvis, calices, and collecting ducts?
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branching morphogenesis.
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what forms the nephrons?
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metanephric blastema
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how does the kidney position change in development?
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kidneys shift more cranially in the abdomen.
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what are pelvic kidneys?
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kidneys that have failed to ascend
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what does the urorectal septum do?
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it divides the cloaca into the urogenital sinus and the anorectal canal
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what are the 3 parts of the urogenital sinus?
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bladder, pelvic part, and phallic part
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what happens to the ureters after they bud from the mesonephric ducts?
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they eventually assume their own entrances to the bladder. the mesonephric duct begins to be absorbed into wall of urogenital sinus
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what happens to the mesonephric duct in males and females?
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females- it degenerates.
males- forms the vas deferens |
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what does a persistent allantois result in?
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urachal fistula
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what is a urachal sinus?
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bladder defect
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what are local areas of allantois persistence?
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urachal cysts
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does the kidney vascular supply change as they ascend?
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yes
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