Sperm motility


The percentage of all moving sperm in a semen sample. In a semen sample, 50% or more of the sperm should normally be moving rapidly.

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  • Sperm stem cell

    A cell that is incapable of fertilizing an egg cell but can give rise to cells that develop into sperm. Sperm stem cells can be grown in laboratory culture, providing a ready source of these cells, as was first demonstrated in mice. Also called a spermatogonial stem cell.

  • Spermatic cord

    A group of structures that go through the inguinal canal to the testis. These structures include the vas deferens, arteries, veins, lymphatic vessels, and nerves.

  • Spermatocide

    Any agent that is destructive to spermatozoa (that is, kills sperm). Nonoxynol-9 is the most commonly encountered spermatocide in the United States. (The nonoxynols, technically speaking, are nonionic surfactant [surface active] mixtures that vary in the number of repeating ethoxy groups.) They are much used as detergents, emulsifiers, wetting and defoaming agents, etc. Nonoxynol-9 has […]

  • Spermatogenesis

    The process of sperm formation. The term was created from the prefix “spermato-” (Greek sperma, the seed or germ) + “genesis” (the coming into being of something) = the coming into being of sperm. Spermatogenesis is in contrast to oogenesis, the process of egg (ovum) formation.

  • Spermicide, vaginal

    A vaginal spermicide is a substance that will kill sperm in the vagina. Vaginal spermicides are available in foam, cream, jelly, film, suppository, or tablet forms. All types contain a sperm-killing chemical. Studies have not produced definitive data on the efficacy of spermicides used alone (without a diaphragm or cervical cap) but research suggests the […]


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