Urethra

Question 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

Answer 1

Prostatic

Question 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

Answer 2

Membranous

Question 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

Answer 3

Penile (spongy, cavernous)

Question 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

Answer 4

Female urethra

Question 5

MICTURATION REFLEX

Answer 5

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

Question 6

3 components of male urethra

Answer 6

Prostatic

Membranous

Penile (spongy, cavernous)