semen


semen
/see"meuhn/, n.
the viscid, whitish fluid produced in the male reproductive organs, containing spermatozoa.
[1350-1400; ME < L semen seed; akin to serere to SOW1]

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Whitish viscous fluid emitted from the male reproductive tract that contains sperm and liquids (seminal plasma) that help keep them viable.

Sperm cells, produced by the testes in humans, represent 2–5% of semen volume; fluids from tubules, glands, and storage areas of the reproductive system bathe them as they travel down, nourishing them, keeping them motile, or participating in certain chemical reactions. During ejaculation, liquids from the prostate gland and seminal vesicles dilute the sperm and provide a suitable, slightly alkaline environment. An average ejaculation of a human male expels 0.1–0.3 cu inches (2–5 ml), containing 200–300 million sperm.

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also called  seminal fluid 
 fluid that is emitted from the male reproductive tract and that contains sperm cells, which are capable of fertilizing the female eggs. Semen also contains other liquids, known as seminal plasma, which help to keep the sperm cells viable.

      In the human male, sperm cells are produced by the testes (singular, testis); they constitute only about 2 to 5 percent of the total semen volume. As sperm travel through the male reproductive tract, they are bathed in fluids produced and secreted by the various tubules and glands of the reproductive system. After emerging from the testes, sperm are stored in the epididymis (epididyme), in which secretions of potassium, sodium, and glycerylphosphorylcholine (an energy source for sperm) are contributed to the sperm cells. Sperm mature in the epididymis; they then pass through a long tube called the ductus, or vas, deferens to another storage area, the ampulla. The ampulla secretes a yellowish fluid, ergothioneine, a substance that reduces (removes oxygen from) chemical compounds, and the ampulla also secretes fructose, a sugar that nourishes the sperm. During the process of ejaculation, liquids from the prostate gland and seminal vesicles (seminal vesicle) are added, which help dilute the concentration of sperm and provide a suitable environment for them. Fluids contributed by the seminal vesicles are approximately 60 percent of the total semen volume; these fluids contain fructose, amino acids, citric acid, phosphorus, potassium, and hormones known as prostaglandins. The prostate gland contributes about 30 percent of the seminal fluid; the constituents of its secretions are mainly citric acid, acid phosphatase, calcium, sodium, zinc, potassium, protein-splitting enzymes, and fibrolysin (an enzyme that reduces blood and tissue fibres). A small amount of fluid is secreted by the bulbourethral (bulbourethral gland) and urethral glands; (urethral gland) this is a thick, clear, lubricating protein commonly known as mucus.

      Essential to sperm motility (self-movement) are small quantities of potassium and magnesium, the presence of adequate amounts of oxygen in the plasma, proper temperature, and a slightly alkaline pH of 7 to 7.5. Sulfate chemicals in semen help prevent the sperm cells from swelling; and fructose is the main nutrient to sperm cells.

      The total volume of semen for each ejaculation of a human male averages between 2 and 5 ml (0.12 to 0.31 cubic inch); in stallions the average ejaculate is about 125 ml (7.63 cubic inches). In human beings each ejaculation contains normally 200 to 300 million sperm. Semen frequently contains degenerated cells sloughed off from the network of tubules and ducts through which the semen has passed.

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Universalium. 2010.

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Look at other dictionaries:

  • Semen — humano en una placa de Petri. Semen[1] (del latín semen) o esperma es el conjunto de espermatozoides y sustancias fluidas que se producen en el aparato genital masculino de todos los animales, entre ellos la especie humana …   Wikipedia Español

  • Semen — Se men (s[=e] m[e^]n), n.; pl. {Semina} (s[e^]m [i^]*n[.a]). [L., from the root of serere, satum, to sow. See {Sow} to scatter seed.] 1. (Bot.) The seed of plants. [1913 Webster] 2. (Physiol.) The seed or fecundating fluid of male animals; sperm …   The Collaborative International Dictionary of English

  • Semen — Pays  France Langue Français Périodicité semestrielle Genre revue scientifique Diffusion éle …   Wikipédia en Français

  • Semen Up — Datos generales Origen Vigo, Galicia, España In …   Wikipedia Español

  • semen — m. sex. Ver esperma. Medical Dictionary. 2011. semen Secreción blanquecina y espesa de …   Diccionario médico

  • semen — late 14c., from L. semen seed, from PIE *si so , reduplication of root *se to sow (Cf. L. serere to sow, O.Prus. semen seed, O.C.S. seme, O.H.G. samo; see SOW (Cf. sow) (v.)) …   Etymology dictionary

  • sêmen — s. m. 1. Semente. 2.  [Fisiologia] Líquido fecundante dos animais. • [Brasil] Plural: sêmenes ou semens.   ♦ Grafia em Portugal: sémen …   Dicionário da Língua Portuguesa

  • sémen — s. m. 1. Semente. 2.  [Fisiologia] Líquido fecundante dos animais. • [Portugal] Plural: sémenes.   ♦ Grafia no Brasil: sêmen …   Dicionário da Língua Portuguesa

  • semen — sustantivo masculino 1. Líquido espeso de color blanco que contiene los espermatozoides y es segregado por las glándulas genitales masculinas. banco de semen. Sinónimo: esperma …   Diccionario Salamanca de la Lengua Española

  • semen — (Del lat. semen). 1. m. Conjunto de espermatozoides y sustancias fluidas que se producen en el aparato genital masculino de los animales y de la especie humana. 2. Bot. Semilla de los vegetales …   Diccionario de la lengua española

  • semen — semen. = sperm (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.


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