Male Urethra

Urethral Segment

Start

End

Features

Urine Extravasation

Prostatic Urethra

Base of the bladder (vesical neck at the apex of the trigone)

Superior fascia of the urogenital diaphragm

thick walls

prostatic ducts

prostatic utricle

ejaculatory ducts

Injury to urethra above urogenital diaphragm will result in intrapelvic, extraperitoneal extravasation

Membranous Urethra

Superior fascia of the urogenital diaphragm

Inferior fascia of the urogenital diaphragm

thin walls

contained within urogenital diaphragm

easily damaged

above urogenital diaphragm: intrapelvic,

extravasation into superficial perineal space

Penile Urethra (Spongy Urethra)

Inferior fascia of the urogenital diaphragm

External Urethral Meatus

ducts of Cowper’s glands

contained w/I body of penis: extravasate into penis

w/i bulb of penis: extravasate into superficial pouch and into scrotum and anterior abdominal wall