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testis, or testicle

primary male sex organs, paired, oval shaped, and enclosed in a sac called the scrotum. The testes produce spermatozoa (sperm cells) and the hormone testosterone

sperm (spermatozoon)

microscopic male germ cell which, when united with the ovum, produces a zygote (fertilized egg) that develops into an embryo


the most important of the male sex hormones. Both males and females have it, but the additional testosterone in males stimulates the growth of the male sex organs in the fetus and the development of the male sex characteristics during puberty

seminiferous tubules

approximately 900 coiled tubes within the testes in which spermatogenesis occurs


coiled duct atop each of the testes that provides for storage, transit, and maturation of spermatozoa

vas deferens, ductus deferens, or seminal duct

Duct carrying the sperm from the epididymis to the urethra. The spermatic cord encloses each vas deferens with nerves, lymphatics, arteries, and veins.

seminal vesicles

two main glands located at the base of the bladder that open into the vas deferens. The glands secrete a thick fluid, which forms part of the semen.

prostate gland

encircles the upper end of the urethra. The prostate gland secretes a fluid that aids in the movement of the sperm and ejaculation


sac suspended on both sides of and just behind the penis. The testes are enclosed in the scrotum.


male organ of urination and copulation

glans penis

enlarged tip on the end of the penis


fold of skin covering the glans penis in uncircumsized males


composed of sperm, seminal fluids, and other secretions

genitalia (genitals)

reproductive organs (male or female)

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