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bulbourethral gland

one of a pair of exocrine glands near the male urethra

Cowper's gland

bulbourethral gland

ejaculation

ejection of sperm and fluid from the male urethra

ejaculatory duct

tube through which semen enters the male urethra

epididymis

one of a pair of long, tightly coiled tubes on top of each testis.

erectile dysfunction

inability of an adult male to achieve an erection

flagellum

hair-like projection on a sperm cell that makes it motile

fraternal twins

two infants of the same pregnancy from two separate ova fertilized by two different sperm

glans penis

sensitive tip of the penis

identical twins

two infantsresulting from division of one fertilized egg into two distinct embryos

impotence

inability of an adult male to achieve an erection

interstitial cells

in the testes, these cells lie between the seminiferous tubules and produce the hormone testosterone

parenchyma

tissue composed of essential and functional cells

perineum

external region between the anus and scrotum

prepuce

fold of skin covering the tip of the penis (foreskin)

prostate gland

exocrine gland at the base of the urinary bladder

scrotum

external sac that contains the testes

semen

spermatozoa and seminal fluid

seminal vesicle

either of paired sac-like male exocrine glands that secretea fluid into the vas deferans

seminiferous tubules

narrow, coiled tubules that produce sperm in the testes

spermatozoon

sperm cell

sterilization

any procedure that removes an individual;s ability to produce or release reproductive cells

stroma

supportive, connective tissue of an organ

testis (testes)

male gonad (testicle) that produces spermatozoa and the hormone testosterone

testosterone

hormone secreted by the interstitial tissue of the testes

vas deferans

narrow tube that carries sperm from the epididymis into the body toward the urethra

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