Most of the male reproductive system is located outside of the body, including the penis, scrotum, and testicles. The internal organs of the male reproductive system, also called accessory organs, include:
- The epididymis
- The vas deferens
- Ejaculatory ducts
- The urethra
- Seminal vesicles
- The prostate gland, and
- Bulbourethral glands, or Cowper's glands
There are three primary hormones involved in the male reproductive system: luteinizing hormone, testosterone, and follicle-stimulating hormone. Luteinizing hormone and follicle-stimulating hormone are produced in the pituitary gland, which is located in the brain, right behind the nose.
Luteinizing hormone stimulates the production of testosterone in the testicles. Testosterone and follicle-stimulating hormone are both involved in sperm production. In addition, testosterone is responsible for the development of male characteristics, including muscle mass and strength, fat distribution, bone mass, facial hair growth, voice change, and sex drive.
In this section, you can learn more about the anatomy of the male reproductive system.