The male urethra



About 15-20 cm long  and conveys both urine and semen
Has three parts

  1. Prostatic part

    (+) Star shaped
    (+) Enclosed by the prostate gland.
    (+) The is the most dilatable part.
    (+) The prostatic ducts and ejaculatory ducts , opens into it.

  2. Membranous part:

    (+) Shortest, least dilatable.
    (+) Apart from external urethral orifice, the narrowest part of the urethra.
    (+) Descends from the prostate to the bulb of the penis
    (+) traverses the sphincter urethrae muscle and inferior fascia of the urogenital diaphragm.
    (+) Bulbo-urethral glands are found on its side.
  • Spongy (Penile part)

    (+) The longest part
    (+) runs the full length of the corpus spongiosum.
    (+) It has two dilatations.

    a) Bulb of urethra in the bulb of the penis
    b) Navicular fossa, in the glans penis

    (+)Two glands open into it.

    a) Bulbo urethral glands
    b) Mucus secreting urethral glands.

Blood supply


  • Arteries derived from the structures it traverses
  • Prostatic arteries from internal pudendal
  • Artery of the bulb
  • Urethral artery



  • With the glans penis – deep inguinal nodes, some to superficial inguinal
  • From the upper part- internal iliac (a few sacral)



  • Branches of the pudendal nerve
  • Autonomic from the inferior hypogastric plexus.
  • Affarent fibres run in pudendal nerve and in pelvic splanchnic nerves.

Summary of Pelvic Viscera