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Flashcards in Urethra Deck (6)
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3 components of male urethra

Prostatic

Membranous

Penile (spongy, cavernous)

1

Courses through the prostate gland

Posterior wall contains the urethral crest where the ejaculatory ducts open

Lateral to urethral crest are the prostatic ducts

Prostatic

2

Courses through the Urogenital diaphragm

Surrounded by deep transverse perineal muscle & sphincter urethrae muscle (external urethral sphincter)= both are skeletal mus, innervated by pudendal nerve

Membranous

3

Course through the penis

Surrounded by corpus Spongiosum

Enlarges into the fossa navicularis just before the external urethral orifice

Bulbourethral glands of Cowper opens just below the urogenital diaphragm

Penile (spongy, cavernous)

4

Courses through the Urogenital diaphragm

Surrounded by the DEEP TRANSVERSE PERINEAL MUSCLE & SPHINCTER URETHRAE MUSCLE (EXTERNAL URETHRAL SPHINCTER)
- both are skeletal muscles, innervated by PUDENDAL NERVE

posterior surface: fuses with the anterior vaginal wall

External urethral sphincter does not completely surround the female urethra
- high incidence of stress incontinence in women

External urethral orifice opens in the vestibule of he vagina between labia minora

Female urethra

5

MICTURATION REFLEX

Sensory: stretch receptors travel to the sacral spinal cord through pelvic splanchnic nerves (parasympathetics, S2-S4)

Motor: pelvic splanchnic nerves (parasympathetic, S2-S4) --> detrussor muscle contract

Sphincter urethrae muscle (ext urethral sphincter)
- voluntary
- innervated by pudendal nerve