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16 Cards in this Set

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Urinary bladder
a hollow distensible muscular organ situated in the pelvic cavity post. to the pubic symphysis.
receives urine via two ureters and stores urine until it is excreted throught the urethra.
rectum
Urinary bladder is located anterior to _______ in male.
vagina
Urinary bladder is located anterior to _______ in female.
Urinary bladder
(shape)
depend on how much urine it contains
if empty, it collapses
when slight distended it becomes spherical
when volume increases, it becomes pear-shaped
Trigone
the floor of the urinary bladder is a small triangular area
urethra
The _______ is in the anterior corner of trigone.
ureteral openings
two post. corners contain the two _____ _____ of the trigone.
Bladder wall histology
Mucosa (mucous membrane plus transitional epithelium)
Rugae present
Submucosa (dense irr. conn. tissue)
Muscular coat (detrusor muscle) 3 layers of smooth muscle
Int. urethral sphincter
Ext. urethral sphincter
Serous coat
Muscular coat (detrusor muscle) 3 layers of smooth muscle
Inner longitudinal
Middle circular
Outer longitudinal
Serous coat
from peritenium
covers superior surface of bladder only
Int. urethral sphincter
what sphincter is involuntary?
Ext. urethral sphincter
what sphincter is voluntary?
Urinary bladder
(FUNCTION)
Urine storage
Micturition
Micturition
The act of expelling urine from the urinary bladder.
Aka - urination or voiding
"micturition reflex"
stretch receptors initiate ________ ______ when urine volume exceeds 200-400 ml.
P.N.S
____ causes contraction of bladder and relaxation of int. sphincter
ext. sphincter is under voluntary control.