| spermatogenesis |
Development of a sperm cell, in the tubules of the testes (the testicular tubules), from spermatogonium and spermatocyte to spermatozoon (the last part of this process, from spermatid to spermatozoon, is called spermiogenesis). The process of spermatogenesis takes 56 days. At any one location in a tubule there are cells at four different stages of maturity (see WebPage 3), so mature sperm are released from a particular location into the lumen of the testicular tubules every 14 days. ...
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| spermatogonium |
The replicating phase of the sperm cell in the testis, equivalent to the oogonium in the ovaries, but, unlike the oogonia, spermatogonia normally persist until old age. Located among the supporting cells (Sertoli cells) in the testicular tubules. Divides by the process of mitosis until it begins to undergo meiosis by changing into the primary spermatocyte, the first step in the process of sperm cell formation, or spermatogenesis. Plural: spermatogonia.
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| spermatozoa |
Plural of spermatozoon.
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| spermatozoon |
The final stage of development of the maturing sperm cell, as it leaves the tubules of the testis (the testicular tubules, to mature in the epididymis. Composed of a head (including the acrosome), a midpiece loaded with mitochondria to provide energy, and a tail, or flagellum (see also cilium), for propulsion. Packed into the head of the spermatozoon is a haploid number of chromosomes (there are normally 23, including either an X-chromosome or a Y-chromosome). ...
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| spermiogenesis |
The final part of the formation of a mature sperm cell, in which the round, early spermatid (already with a haploid number of chromosomes) loses its round shape to acquire the features of the mature, elongated spermatozoon. Contrast with spermatogenesis, which encompasses spermiogenesis as it's completed.
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