The verumontanum is a smooth filling defect along the posterior wall of the prostatic urethra. The membranous urethra is the shortest segment (~ 1-1.5 cm) and passes through the urogenital diaphragm. The paired Cowper glands lie within the urogenitaldiaphragm but their ducts extend ~ 2 cm to enter the bulbous urethra.

The bulbous urethra begins just below urogenital diaphragm at the bulbomembranousjunction (BMJ). Just distal to the BMJ, there is a conical widening of the bulbous urethra called the "cone". A musculotendinous sling of the bulbospongiosus muscle may cause an indentation just distal to the cone. This should not be confused with a stricture. The proximal-to-mid bulbous urethra widens and is termed the "sump". There is a mild angulation of the urethra at the penoscrotal junction. The penile or pendulous urethra is distal to this point