To measure your hormone levels. The cells divide and change until they have a head and short tail, like tadpoles. That is, these immature sperm cells make exact copies of themselves. Images provided by the nemours foundation, istock, getty images, veer, shutterstock, and clipart. The prostate gland, which produces some of the parts of semen, surrounds the ejaculatory ducts at the base of the urethra, just below the bladder. These originals are then saved for future use, while the duplicates transform themselves into four mature sperm each. 5, 2010, 3:18 p.
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Boys make sperm. Some boys are circumcised, which means that a doctor or clergy member cuts away the foreskin. The epididymis and the testicles hang in a pouch-like structure outside the pelvis called the scrotum. The inside of the penis is made of a spongy tissue that can expand and contract. Without success, this condition could be the cause. It takes sperm about 4 to 6 weeks to travel through the epididymis.
What causes it?
It can happen because of: The brain and the nervous system give the scrotum the cue to change size.