Urinary Bladder - Urinary System Urinary Bladder * *...

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Urinary System Urinary Bladder * Muscular sac on the floor of the pelvic cavity * Is covered by parietal peritoneum on its flattened superior surface and by a fibrous adventitia elsewhere Urinary Bladder * Its muscularis, called the detrusor muscle , consist of three layers of smooth muscle * The mucosa has transitional epithelium Urinary Bladder * Mucosa is wrinkled (rugae) when relaxed. * The opening of the two ureters and the urethra mark a smooth-surface triangular area called the trigone on the bladder floor * The bladder is highly distensible * The maximum capacity is 700 to 800 mL Sacral Micturition Reflex Micturition Control * The body of the bladder is rich in sympathetic beta adrenergic receptors whose fibers are via the hypogastric nerve * Stimulation suppress contractions of the detrusor muscle and internal sphincter * parasympathetic stimulation, by fibers in the pelvic nerve , cause the detrusor to contract and relaxation of the internal sphincter. * Sympathetic
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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