Vocabulary
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| bulbourethral glands | Pair of exocrine glands near the male urethra. They secrete fluid into the urethra. Also called Cowper glands.
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| ejaculation | Ejection of sperm and fluid from the male urethra.
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| ejaculatory duct | Tube through which semen enters the male urethra.
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| epididymis (plural; epididymides) | One of a pair of long, tightly coiled tubes above each testis. It stores and carries sperm from seminiferous tubules to the vas deferens.
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| erectile dysfunction | Inability of an adult male to achieve an erection; impotence.
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| flagellum | Hair-like projection on a sperm cell that makes it motile (able to move).
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| fraternal twins | Two infants resulting from fertilization of two separate ova by two separate sperm cells.
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| glans penis | Sensitive tip of the penis; comparable to the clitoris in the female.
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| identical twins | Two infants from division of one fertilized egg into two distinct embryos. Conjoined ("Siamese") twins are incompletely separated identical twins.
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| interstitial cells of the testes | Specialized cells that lie adjacent to the seminiferous tubules in the testes. These cells produce testosterone and are also called Leydig cells.
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| parenchymal tissues | Essential distinctive cells of an organ. In the testis, the seminiferous tubules that produce sperm are parenchymal.
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| penis | Male external organ of reproduction.
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| perineum | External region between the anus and scrotum in the male.
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| prepuce | Foreskin; fold of skin covering the tip of the penis.
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| prostate gland | Exocrine gland at the base of the male urinary bladder. The prostate secretes fluid that contributes to semen during ejaculation. HINT: Don't confuse prostate with prostrate, which means lying down.
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| scrotum | External sac that contains the testes.
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| semen | Spermatozoa (sperm cells) and seminal fluid (prostatic and seminal vesicle secretions), discharged from the urethra during ejaculation.
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| seminal vesicles | Paired sac-like exocrine glands that secrete fluid (a major component of semen) into the vas deferens.
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| seminiferous tubules | Narrow, coiled tubules that produce sperm in the testes.
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| spermatozoon (pluarl: spermatozoa) | Sperm cell.
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| sterilization | Procedure that removes a person's ability to produce or release reproductive cells; removal of testicles, vasectomy, and oophorectomy are sterilization procedures.
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| stromal tissue | Supportive, connective tissue of an organ, as distinguished from its parenchyma. Also called stroma.
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| testis (ral: testes) | Male gonad (testicle) that produces spermatozoa and the hormone testosterone. Remember: Testis means one testicle, and testes are two testicles.
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| testosterone | Hormone secreted by the interstitial tissue of the testes; responsible for male sex characteristics.
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| vas deferens | Narrow tube (one on each side) carrying sperm from the epididymis toward the urethra. Also called ductus deferens.
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