Chapter 28

Chapter 28

Lecture 24 Urinary System 28-1 Urinary System Anatomy Anterior Kidney Ureter Stomach Pancreas Large intestine Abdominal aorta Renal vein Renal artery Liver Inferior vena

cava Right kidney Renal hilum Fibrous capsule Spleen Urinary bladder Urethra (a) Anterior view Fat Rib Left kidney Posterior Fig. 27.2

Fig. 27.1 External Anatomy of Kidneys Renal capsule surrounds each kidney Hilum renal artery and nerves enter and renal vein and ureter exit kidneys 28-2 Internal Anatomy of Kidneys Renal cortex: Outer area Renal columns Renal medulla: Inner area Renal pyramids Calyces

Fig. 27.3 Major: Converge to form renal pelvis Minor: Collects urine from individual renal pyramid Nephron: Functional unit of kidney 28-3 Renal corpuscle The Nephron Bowmans capsule Glomerulus network of capillaries Arterioles

Afferent blood to glomerulus Efferent drains Tubules Proximal (convoluted) tubule Loops of Henle Descending limb Ascending limb Fig. 27.5 Distal (convoluted) tubule Collecting ducts 28-4 Ureters and Urinary Bladder

Ureters tubes through which urine flows from kidneys to urinary bladder Urinary bladder Ureter Peritoneum stores urine Urethra transports urine from bladder to outside of body difference in length between males and females sphincters Internal urinary External urinary

Ureteral openings Neck of urinary bladder Internal urethral sphincter External urethral sphincter Fig. 27.9 28-5 Review Question Think back for a moment to the lectures on histology. What type of epithelium would line the inside of the ureters and urinary bladder? (a) Stratified squamous (b) Pseudostratified columnar (c) Simple cuboidal (d) Transitional (e) Simple squamous 28-6

Points to Remember Kidney filters blood to eliminate metabolic wastes (e.g. urea formed from ammonia that is removed from blood by liver) and reabsorb substances such as sugars, amino acids, sodium and chloride Functional unit of kidney is nephron Ureters, urinary bladder and urethra transport urine (product of nephron) outside of body 28-7 Questions? 28-8

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