<prompt> Length of the male adult urethra is -20 cms10 cms4 cms15 cms  <response>: Urethra- Lengtho Male - 20 cmso Female - 4 cms- Shortest part of the male urethra- Membranous part- The longest part of the male urethra- Penile urethra- Location of sphincter urethrae- Membranous part- Prostatic urethrao Widest parto Most dilatable parto Concave anteriorly.o Route- downwards forwards. Exit prostate slightly anterior to its apex.o Crescentic on the cross sectiono Structures on the posterior wall Urethral crest Colliculus seminalis verumontanum Opening of ejaculatory ducts Prostatic sinuses with the opening of prostate glandso Lymphatics Membranous part- Internal iliac nodes Prostatic part- Internal iliac nodesPenile urethra- Deep inguinal nodes. 