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The key male reproductive organs include the testes, epididymis,
urethra, vas deferens, prostate gland, seminal vesicle, and
penis.
The testes are composed of coiled structures called seminiferous
tubules, which are the sites of sperm production. The structure on
top of the seminiferous tubules in the testes is the epididymis.
The sperm migrate from of the seminiferous tubules to the
epididymis. Within the epididymis, the sperm mature while they are
stored in this structure.
The ejaculation process begins as the penis fills with blood and
becomes erect. With sufficient stimulation, mature sperm travel
from the epididymis through the vas deferens, a muscular tube,
which propels sperm forward through smooth muscle contractions. The
sperm arrive first at the ampulla, where secretions from the
seminal vesicle are added.
From the ampulla, seminal fluid is propelled forward through the
ejaculatory ducts toward the urethra, passing first by the prostate
gland, where a milky fluid is added to form semen. Finally, the
semen is ejaculated through the far end of the urethra.
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