Urethra Anatomy

1. Intramural (preprostatic) part
2. Prostatic
3. Intermediate (membranous)
4. Spongy or bulba urethra
5. penile segment

1,2 and 3 is denoted as posterior urethra and

4 & 5 make anterior urethra

In case of pelvic fracture, the membranous part or bulbomembranous portion is prone to injury