| accessory glands | The glands that produce the seminal fluid portion of the semen. 120
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| adrenal gland | A small endocrine gland atop each kidney, the source of a wide variety of important hormones. 88, 126, 279
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| ampulla | Expansion near end of vas deferens. 119
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| anabolic steroids | Synthetic testosterones that stimulate the growth of muscle mass. 129
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| androgens | Hormones that promote the development of male or malelike sexual structures and characteristics. 88, 126, 202
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| cavernous bodies | See corpora cavernosa. 110
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| circumcision | The surgical removal of part or all of the foreskin of the penis. 115
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| climacteric | Hormonal changes during midlife and their effects; the group of physical changes that occur during an older person's period of declining sexual functions. 128, 360
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| corpora cavernosa | The upper two erectile bodies in the shaft of the penis. 110
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| corpus spongiosum | The lower erectile body in the shaft of the penis. 110
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| Cowper's glands | Two glands located exterior to the prostate that produce preejaculatory fluid; the bulbourethral glands. 121
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| cremaster muscle | Surrounds spermatic cord. 117
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| dartos muscle | muscle in scrotum. 117
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| ejaculation | The emission and expulsion of semen from the erect penis. 122, 209
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| ejaculatory duct | The last section of vas deferens before it joins with the urethra. 119
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| emission | The discharge of seminal fluid from the accessory glands and filling of the urethral bulb; the first phase of ejaculation. 122, 209
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| endocrine glands | Glands that produce and secrete hormones into the blood. 85, 125
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| epididymis | The tightly coiled genital duct located on the side of each testis in which sperm are stored. 118
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| erectile bodies | Bodies of tissue in the penis, capable of becoming erect. 110
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| expulsion | The second phase of ejaculation in which semen is expelled from the penis. 122, 209
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| fellatio | Oral stimulation of a man's genitals. 121, 242
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| flaccid | Relaxed, not erect. 110
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| follicle-stimulating hormone (FSH) | The pituitary hormone that acts on the ovarian follicle in the ovary and on the sperm-producing cells of the testes. 87, 125
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| genital ducts | Ducts that carry sperm and semen. 118
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| glans penis | The head of the penis. 110
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| gonadotropin-releasing hormone (GnRH) | A hypothalamic hormone that directs the release of pituitary sex hormones. 86, 125
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| gonadotropins | The pituitary hormones that stimulate activity in the gonads, or the testes and ovaries. 125
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| hormones | The chemicals produced by and released into the blood by the endocrine glands to serve as internal chemical regulators in the body. 85, 125
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| hypothalamus | The lower portion of front of brain, from which the pituitary gland is suspended. 86, 125
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| inhibin | A hormone that inhibits the production of FSH, LH, and GnRH. 89, 126
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| interstitial cells | Cells in the testes that produce and secrete testosterone. 118
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| interstitial cell-stimulating hormone (ICSH) | The pituitary hormone that acts on interstitial cells of testes to stimulate the production of testosterone. 125
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| lobules | Compartments in testis. 117
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| nocturnal emission | The expulsion of semen during sleep; a "wet dream." 124
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| orgasm | The peak, or climax, of sexual arousal and response; characterized by a series of highly pleasurable muscular contractions of the pelvic floor and the sudden discharge of accumulated sexual tensions, and, in males, ejaculation. 123, 207
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| pituitary gland | An endocrine gland beneath the hypothalamus that produces hormones, including gonadotropins. 87, 125
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| prostaglandins | Fatty acid substances that stimulate muscle contraction. 94, 120
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| prostate gland | A gland surrounding the neck of the urinary bladder in men that produces the prostatic fluid portion of seminal fluid. 120
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| retrograde ejaculation | Reverse ejaculation of semen into the urinary bladder. 124
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| semen | A man's ejaculate. 121, 410
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| seminal fluids | That portion of semen produced and secreted by the accessory glands. 120
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| seminal vesicles | The two accessory glands near the prostate gland that produce and secrete seminal fluid. 120
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| seminiferous tubules | The ducts in the testes from which sperm cells are produced. 118
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| sex glands | Glands that produce and secrete sex hormones. 125
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| spermatic cord | The cord that suspends the testes in the scrotum. 116
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| spermatogenic cells | Cells in testes that produce sperm cells. 118
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| sperm capacitation | The process in which sperm acquire the capacity to fertilize an ovum. 121, 410
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| sphincter | Muscle that surrounds an opening which closes when muscle contracts. 122
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| spongy body | The lower erectile body in the shaft of the penis. 110
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| testosterone | A man's primary sex hormone; the most important androgen. 126
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| urethra | The duct from the urinary bladder to a woman's vaginal vestibule or through a man's penis. 78, 110
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| urinary meatus | opening of urethra on glans. 120
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| urogenital system | The system of urinary and reproductive organs. 130
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| urology | The medical specialty treating urogenital organs and their conditions. 130
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| vas deferens | The genital duct that carries sperm from the epididymis to the inside of the man's body. 119
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| vasectomy | The sterilization of a man by surgically interrupting his vas deferens to prevent the passage of sperm. 119, 396
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2002 McGraw-Hill Higher Education