What does a human penis look like

Structure and function of the male sexual organs

The internal sex organs include

  • Testicles(Testis),
  • Epididymis(Epididymis),
  • Vas deferens(Ductus deferens) and
  • Sex glands.

At ~ 20 grams, it is the size of a chestnut prostate(Prostate) the largest and best known sex gland; then there are those Seminal vesicles(Vesiculae seminales) and the Cowper's glands(Glandulae bulbourethrales). All three produce the seminal fluid which, together with the sperm cells formed by the testes, produce the Ejaculate results. The ejaculate is thin, milky and has a characteristic smell of chestnut blossoms. To neutralize the acidic environment of the vagina with a pH of 5.5, it has a slightly alkaline pH of 7.3 - and it contains enzymes to activate the sperm. The male sex hormone is responsible for the production of semen, the formation and development of the male reproductive organs and characteristics testosterone responsible. It is produced by specialized cells called Leydig cells, which are located between the testicular tubules and the blood vessels.

Front view of male genital organs. The course of the spermatic cord (funiculus spermaticus), which transports the semen from the testes to the urethra, is unusual: As you can see in the picture, it describes a wide arc to the abdominal wall (left side in the picture), and then back into the inguinal canal Enter the abdominal and pelvic cavities and reach the prostate. This detour is evolutionary because the testicles are initially located in the abdominal cavity and only migrate outward into the scrotum around birth.
Georg Thieme Verlag, Stuttgart

The external genital organs include

  • penis(Limb) and
  • Scrotum(Scrotum).

The penis is made up of Penis shaft and Acorn(Glans penis). It is covered by a stretchy skin in the form of a fold, the foreskin(Prepuce), covering the glans. Two forms of cavernous bodies are to be distinguished, both of which are enclosed by a connective tissue capsule: The paired Penile cavernous body(Corpus cavernosum penis), which enables erection, and the Cavernous urethra(Corpus spongiosum penis), which is located on the underside of the penis and ends with the glans. In the erectile tissue of the urethra the urethra(Urethra).


Dr. med. Martina Sticker, Dr. med. Arne Schäffler in: Gesundheit heute, edited by Dr. med. Arne Schäffler. Trias, Stuttgart, 3rd edition (2014). Revision and update: Dr. med. Sonja Kempinski | last changed on at 16:38