The external structures of the male reproductive system include the penis and scrotum. The internal structures include the vas deferens, testes (testicles), urethra, prostate gland, and seminal vesicles.

Sperm, which carries the man's genes, is made in the testes and stored in the seminal vesicles. During ejaculation, sperm is transported along with a fluid called semen through the urethra.

Male Reproductive Organs

Last full review/revision August 2007 by Paul D. Lui, MD