Multiple choice The second constriction of male urethra lies in prostatic portion of urethra membranous part external urethral orifice internal urethral orifice Reveal answer Fill a bubble to check yourself B Correct answer Explanation It is the part of the male urethra lying between the layers of the urogenital diaphragm and connects the parts of the urethra passing through the prostate gland and the penis. The second constriction of male urethra lies in membranous part.