Urinary Bladder
Urinary Bladder
Urinary Bladder
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Ureter<br />
Detrusor<br />
muscle<br />
Ureteral<br />
openings<br />
Trigone<br />
Urethra<br />
Urogenital<br />
diaphragm<br />
External urethral<br />
orifice<br />
(a) Female<br />
Figure 23.23a<br />
Female Urethra<br />
Internal urethral<br />
sphincter<br />
External urethral<br />
sphincter<br />
• 3 to 4 cm long<br />
• bound to anterior wall of vagina<br />
• external urethral orifice<br />
– between vaginal orifice and<br />
clitoris<br />
• internal urethral sphincter<br />
– detrusor muscle thickening<br />
– smooth muscle under<br />
involuntary control<br />
• external urethral sphincter<br />
– where the urethra passes<br />
through the pelvic floor<br />
– skeletal muscle under<br />
voluntary control<br />
23-7
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