Speed
Common street name for a stimulant drug, especially for an amphetamine.
Amphetamines have been used to treat hyperactivity in children, the symptoms of narcolepsy, and as an appetite suppressant and they are also frequently abused as a stimulant of the central nervous system.
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- Sperm
A sperm is the male “gamete” or sex cell. It combines with the female “gamete,” called an ovum, to form a zygote. The formation process is called “fertilization.” (see ovum, zygote).
- Sperm function
The capability of sperm to function — to penetrate and fertilize the egg.
- 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.
- 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.