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spermatozoon |
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spermatozoon: see sperm sperm or spermatozoon (spûr'mətəzō`ən, –zō`ŏn) ..... Click the link for more information. . spermor spermatozoonMale reproductive cell. In mammals, sperm are produced in the testes and travel through the reproductive system. At fertilization, one sperm of the roughly 300 million in an average ejaculation (see semen) fertilizes an egg (see ovary) to produce an offspring. At puberty, immature cells (spermatogonia) begin a maturation process (spermatogenesis). A mature human sperm has a flat, almond-shaped head, with a cap (acrosome) containing chemicals that help it penetrate an ovum. It is essentially a cell nucleus, with 23 chromosomes (including either the X or Y that determines the child's sex). A flagellum propels the sperm, which may live in a woman's reproductive tract for two to three days after sexual intercourse, to the egg. Sperm may be frozen and stored for artificial insemination. spermatozoon any of the male reproductive cells released in the semen during ejaculation, consisting of a flattened egg-shaped head, a long neck, and a whiplike tail by which it moves to fertilize the female ovum How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| We could not detect any alteration in the form of the spermatids and spermatozoids. A quick sketch, circa 1949, shows a pile of lines more or less evocative of spermatozoids to which two tires are added toward the bottom; "Will Jackson Pollock affect our cars? |
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