. detrusor muscle of urinary bladder • external urethral orifice • external urethral sphincter • internal urethral orifice 1 2 3 COM 4 5 9 (opening) • internal urethral sphincter ● trigone (TRY-goan) • ureteral openings • ureters • urethra 6 7 8 9 FIGURE 36.4 Ureters, urinary bladder, and urethra in a female.

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