Ch. 26 Urinary System - Ch 26 Urinary System I Organs 1 Kidneys(2 2 Ureters(2 tubes 3 Urinary bladder 4 Urethra pathway B Kidney is stabilized by 3

Ch. 26 Urinary System - Ch 26 Urinary System I Organs 1...

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Ch. 26 Urinary SystemI.Organs:1.Kidneys: (2)2.Ureters: (2) tubes3.Urinary bladder4.Urethra: pathwayB.Kidney is stabilized by 3 connective tissues:1.Renal capsule: inner layer (collagen fibers cover the kidney)2.Adipose : (peri-nephronic fat) middle layer3.Renal fascia: outer layer anchors to dorsal body wall (retroperitoneal)C.Kidney:1.Renal cortex: contains nephrons2.Renal medulla:a.Pyramids: 6-18b.Papillac.Columnsd.Minor calyx (pl. “calyces”)e.Major calyxf.Pelvisg.Hilum** Renal lobe: part of cortex + 1 pyramid + column** Renal blood vessels:Renal artery --Segmental art.Renal vein interlobar art.Interlobar v. arcuate art.Arcuate v. interlobular art.Interlobular v. (= cortical radiate a.)(= cortical radiate v.)afferent arterioles(glomerulus)Venules efferent arteriolesPeritubular capillaries Nephron:1.Corpuscle:A.Bowman’s capsule: a cup-shaped chamber* parietal epithelium: (simple squamous)B.Glomerulus: a capillary network* visceral epithelium: (= podocytes): foot-shaped cells(pedicels of podocyte= filtration slits)1
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2.Renal tubule:A.Proximal convoluted tubule (PCT): cuboidal cellsB.Loop of Henle:a.Descending limb(1). Thick segment: cuboidal cells(2). Thin segment: squamousb. Ascending limb(1). Thin segment: squamous(2). Thick segment: cuboidal
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