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How is sperm formed?
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How is sperm formed?
human-reproduction
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Sperm formation:
A male begins to produce sperm during puberty.
Seminiferous tubules within each testes form sperm.
Near the outer surface of these tubules there are undifferentiated cells called spermatogonia. These are stem cells that remain able to divide.
The process of making and maturing a sperm cell begins with spermatogonia. Spermatogonia undergo meiotic divisions leading to sperm formation.
Sperm production involves several cell divisions called mitosis and meiosis.
Mitosis produces diploid cells, and meiosis produces haploid cells
meiosis division - reduction division; forms reproductive cells in humans; takes place only in the testes during sperm production; chromosome number is reduced from the normal 46 to 23 during production of sex cells (sperm has 23 chromosomes)
mitosis division - duplication division; duplicates cells; ensures chromosome number stays constant i.e., 46 chromosomes
Sertoli cells provide nutrition to the dividing germ cells i.e., regulate the process of spermatogenesis.
Thus spermatogenesis (the process of sperm formation) by the process of meiosis and maturation takes about 65-75 days for the sperm to go through the growth from spermatogonia to sperm.
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