Unit 13 Genitourinary System

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Unit 13 Genitourinary System

  1. 1. Facebook: h_noveno@hotmail.com Instagram: Nio Noveno I hope you will make good use of my slides. Enjoy learning! 
  2. 2. ORGANS OF THE URINARY SYSTEM Kidneys Ureters Urinary bladder Urethra ANATOMY h_noveno@hotmail.com 3
  3. 3. LOCATION OF THE KIDNEYS • • • • Against the dorsal body wall At the level of T12 to L3 The right kidney is slightly lower than the left Attached to ureters, renal blood vessels, and nerves at renal hilus • Atop each kidney is an adrenal gland ANATOMY h_noveno@hotmail.com 4
  4. 4. COVERINGS OF THE KIDNEYS • Renal capsule – Surrounds each kidney • Adipose capsule – Surrounds the kidney – Provides protection to the kidney – Helps keep the kidney in its correct location ANATOMY h_noveno@hotmail.com 5
  5. 5. REGIONS OF THE KIDNEY • Renal cortex – outer region • Renal medulla – inside the cortex • Renal pelvis – inner collecting tube ANATOMY h_noveno@hotmail.com 6
  6. 6. ANATOMY h_noveno@hotmail.com 7
  7. 7. KIDNEY STRUCTURES • Medullary pyramids – triangular regions of tissue in the medulla • Renal columns – extensions of cortex-like material inward • Calyces – cup-shaped structures that funnel urine towards the renal pelvis ANATOMY h_noveno@hotmail.com 8
  8. 8. ANATOMY h_noveno@hotmail.com 9
  9. 9. ANATOMY h_noveno@hotmail.com 10
  10. 10. BLOOD FLOW IN THE KIDNEYS ANATOMY h_noveno@hotmail.com 11
  11. 11. Stages of Urine Formation (Micturition) [glomerular filtration rate = 125 ml/min] 1. Filtration: glomerulus 2. Reabsorption: tubules – Proximal convoluted tubules • Major reabsorption of electrolytes – Na, K, Ca, Mg, Cl – Loop of Henle • Major reabsorption site for Na – Collecting tubule • H2O reabsorption 3. Secretion ANATOMY h_noveno@hotmail.com 12
  12. 12. RENAL CIRCULATION ANATOMY h_noveno@hotmail.com 13
  13. 13. RENAL CIRCULATION ANATOMY h_noveno@hotmail.com 14
  14. 14. NEPHRONS • The structural and functional units of the kidneys • Responsible for forming urine • Main structures of the nephrons – Glomerulus – Renal tubule ANATOMY h_noveno@hotmail.com 15
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  17. 17. ANATOMY h_noveno@hotmail.com 18
  18. 18. GLOMERULUS • A specialized capillary bed • Attached to arterioles on both sides (maintains high pressure) – Large afferent arteriole – Narrow efferent arteriole ANATOMY h_noveno@hotmail.com 19
  19. 19. RENAL TUBULE • • • • Glomerular (Bowman’s) capsule Proximal convoluted tubule Loop of Henle Distal convoluted tubule ANATOMY h_noveno@hotmail.com 20
  20. 20. RENAL TUBULE ANATOMY h_noveno@hotmail.com 21
  21. 21. TYPES OF NEPHRONS • Cortical nephrons – Located entirely in the cortex – Includes most nephrons • Juxtamedullary nephrons – Found at the boundary of the cortex and medulla ANATOMY h_noveno@hotmail.com 22
  22. 22. TYPES OF NEPHRONS ANATOMY h_noveno@hotmail.com 23
  23. 23. PERITUBULAR CAPILLARIES • • • • • Arise from efferent arteriole of the glomerulus Normal, low pressure capillaries Attached to a venule Cling close to the renal tubule Reabsorb (reclaim) some substances from collecting tubes ANATOMY h_noveno@hotmail.com 24
  24. 24. URETERS • Slender tubes attaching the kidney to the bladder – Continuous with the renal pelvis – Enter the posterior aspect of the bladder • Runs behind the peritoneum • Peristalsis aids gravity in urine transport ANATOMY h_noveno@hotmail.com 25
  25. 25. ANATOMY h_noveno@hotmail.com 26
  26. 26. LINING OF THE URETER ANATOMY h_noveno@hotmail.com 27
  27. 27. URINARY BLADDER • Smooth, collapsible, muscular sac • Temporarily stores urine • Trigone – three openings – Two from the ureters – One to the urethrea • Urinary Bladder Wall – – – – ANATOMY Three layers of smooth muscle (detrusor muscle) Mucosa made of transitional epithelium Walls are thick and folded in an empty bladder Bladder can expand significantly without increasing internal pressure h_noveno@hotmail.com 28
  28. 28. URINARY BLADDER WALL ANATOMY h_noveno@hotmail.com 29
  29. 29. ANATOMY h_noveno@hotmail.com 30
  30. 30. URETHRA • Thin-walled tube that carries urine from the bladder to the outside of the body by peristalsis • Release of urine is controlled by two sphincters – Internal urethral sphincter (involuntary) – External urethral sphincter (voluntary) ANATOMY h_noveno@hotmail.com 31
  31. 31. URETHRA GENDER DIFFERENCES • Length – Females – 3–4 cm (1 inch) – Males – 20 cm (8 inches) • Location – Females – along wall of the vagina – Males – through the prostate and penis • Function – Females – only carries urine – Males – carries urine and is a passageway for sperm cells ANATOMY h_noveno@hotmail.com 32
  32. 32. DEVELOPMENTAL ASPECTS OF THE URINARY SYSTEM • Functional kidneys are developed by the third month • Urinary system of a newborn – Bladder is small – Urine cannot be concentrated • Control of the voluntary urethral sphincter does not start until age 18 months • Urinary infections are the only common problems before old age ANATOMY h_noveno@hotmail.com 33
  33. 33. AGING AND THE URINARY SYSTEM • There is a progressive decline in urinary function • The bladder shrinks with aging • Urinary retention is common in males ANATOMY h_noveno@hotmail.com 34

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