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The urinary system.docx

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BIOL 301
Vivian Dayeh

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The urinary system ­ maintain the chemical consistency of blood  o send toxins, metabolic wastes, and excess water out of the body  o main waste products▯urea, uric acid, creatinine(from muscle) Main organs of the  urinary system Kidneys – forms urine   th External Anatomy Retroperitoneal(behind parietal perdtoneum)▯T12­L3(12   thoracic certebra superiorly to 3  lumbar vertebra inferiorly) Secured and surrounded by 3 layers of tissue(superficial to  deep) pg. 722 ­ renal fascia▯thin layer of dense CT to anchor kidney in   position ­ adipose capsule(perirenal fat capsule)▯cushions and  anchors ­ renal capsule(outermost layer)▯fibrous CT on outer  layer of kidney itself▯shapes kidney Hilum(picture): vertical cleft containing vessels, ureter and  nerves Internal anatomy Two distinct regions:  1. renal cortex▯superficial region  2. renal medulla▯deep to cortex  ­ contain renal pyramids separated by renal columns renal pelvis▯funnel shaped tube ­ contain branching extensions to form major calices  which divide to form minor calices Kidney blood supply Blood travels from aorta▯renal artery▯segmental  artery▯interlobar artery▯arcuate artery▯cortical radiate  artery▯ afferent arterioleg▯ lomerulus(capillaries)E▯ fferent  arteriolep▯ eritubular capillaries and vasa recta c ▯ ortical  radiate vein▯arcuate vein▯interlobar vein▯renal vein▯inferior  vena cava The nephron –  Components:  functional unit of  ­ renal corpuscle: the renal corpuscle consists of the  kidney glomerulus and the glomerular(Bowman’s 
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