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Sperm Production Cycle. The fundamental building block of male fertility is the sperm cell. Often thought of as a “lean, mean racing machine,” sperm cells are essentially concentrated packets of genetic material (DNA) with a propeller designed to get them to the egg. The mature sperm cell, however, is .

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The Testicular Factory. Sperm are produced in the male testicle (testis). The testis is filled with tiny coiled tubes (seminiferous tubules) through which sperm move as they are produced. Each seminiferous tubule is lined with sperm nurse cells (Sertoli cells) and sperm stem cells (Spermatagonia).

Sperm concentration. Also called sperm density, this is the number of sperm in millions per milliliter of semen. Fifteen million or more sperm per mL is considered normal. Sperm motility. Some of the parameters are indicators of sperm production and health (see How Sperm are Made) others relate the the quality of the semen and its ability to help sperm along the journey to the [ ] Heat based contraception – natural birth control for men – Don't Cook Your Balls November 21, at .
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Male factor infertility is defined as an abnormality in either sperm production or function. Although this condition is very common – accounting for approximately 50% of all cases of infertility – a proper evaluation of the male partner is frequently overlooked during the routine infertility evaluation.

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A male who has reached puberty will produce millions of sperm cells every day. Each sperm is extremely small: only 1/ of an inch ( millimeters long). Sperm develop in the testicles within a system of tiny tubes called the seminiferous tubules.

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