Science / Biology / Testes: The male gonad; produce spermatozoa and male sex hormones. Male gonads in mammals. Singular, testis. Paired organs that contain seminiferous tubules in which sperm are produced.

Klinefelters Syndrome

Science / Psychiatry / Klinefelters Syndrome: Chromosomal defect in males in which there is an extra X chromosome; manifestations may include underdeveloped testes, physical feminization, sterility, and mental retardation. MORE


Science / Biology / Scrotum: In mammals, a pouch of skin located outside the body cavity into which the testes descend; provides proper temperature for the testes. MORE

Vas Deferens

Science / Biology / Vas Deferens: The duct that carries sperm from the epididymis to the ejaculatory duct and urethra. The tube connecting the testes with the urethra. MORE

Seminiferous Tubules

Science / Biology / Seminiferous Tubules: Tubules on the interior of the testes where sperm are produced. MORE