KINESIOL 2YY3 Lecture Notes - Lecture 22: Retroperitoneal Space, Urethral Sphincters, Histology
19 Mar 2018
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25 - 30 cm long, 1-10 mm diameter. As the bladder fills, bladder wall compresses opening. Flow results from peristalsis, gravity and hydrostatic pressure. Hollow distensible muscular organ with capacity of 700-800 ml. Females - is anterior to vagina, inferior to uterus. Urethra exits the bladder on the anterior inferior part. When we ejaculate / the bladder is filling up. Where the urethra comes in contact with outside. Rugae of mucosa - allow expansion of urinary bladder if it fills. Peritoneum - on top of the bladder at the superior surface. We start to have receptors send a signal at this fullness. Send the micturition center in sacral spinal cord (s2 and s3) and reflex is triggered. Parasympathetic fibers cause detrusor muscle to contract, external and internal sphincter muscles to relax. Filling causes sensation of fullness - desire to urinate. Cerebral cortex can initiate micturition or delay its occurrence for a limited period of time.
