Urinary System Notes Ch26 2014 - A\/P 242 Anatomy Physiology II(BIOL&242 Gary Brady 2014 SFCC Life Sciences Text 13th ed of Tortora Chapter 26 URINARY

Urinary System Notes Ch26 2014 - A/P 242 Anatomy...

This preview shows page 1 - 3 out of 6 pages.

A/P 242 / Anatomy & Physiology II (BIOL&242) Gary Brady / 2014 SFCC Life Sciences Text: 13 th ed of Tortora Chapter 26: URINARY SYSTEM Kidneys are: 1. Paired. (right is slightly lower than left because of liver). 2. Retroperitoneal. (behind the parietal peritoneum of the abdominal cavity). 3. Adult size = ~ 4 1/2 inches long, 2 1/2 inches wide, 1 inch thick. Nephroptosis = floating kidney. May cause kink in ureter, block urine flow and damage kidney. Three layers of tissue surround each kidney: 1. Renal capsule (innermost layer) 2. Adipose capsule 3. Renal fascia (outer layer) Kidneys are only 1% of body mass but get 25% of blood flow (1200 mls per minute). Our entire 5 liter blood supply is filtered by the kidneys 60 times per day (300 liters per day). GROSS ANATOMY OF INTERNAL KIDNEY : Renal cortex (cortical nephrons) Renal medulla (juxtamedullary nephrons) Renal pyramids Renal columns Renal papilla Papillary ducts Minor calyces (calyx) Major calyces Renal pelvis Renal sinus Hilus Urethra lengths : Female = 4 cm (1 1/2 inches)
Image of page 1
Male = 15-20 cm ( (6-8 inches) Kidneys>>>Ureters>>>Bladder>>>Urethra Urinary bladder has rugae for expansion, except in the trigone area of the bladder. Detrusor muscle = smooth muscle of bladder. It has three smooth muscle layers, (longitudinal>>>circular>>>longitudinal), which contract so urinary bladder can be emptied. The bladder also has transitional epithelium which is able to change shape for bladder contraction or distension. PATH OF URINE FLOW IN MALE : Collecting duct Papillary duct Minor calyx Major calyx Renal pelvis Ureter Urinary bladder Internal urethral sphincter Prostatic urethra (passes through prostate gland) External urethral sphincter (in urogenital diaphragm) Membranous urethra (passes through urogenital diaphragm and is the shortest section of the male urethra)
Image of page 2
Image of page 3

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture