Sperm cell: Difference between revisions
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The sperm cell is the male cell used for procreation. It is a [[haploid]], so that the its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell with 46 chromosomes. |
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#REDIRECT [[Sperm]] |
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== Spermatogenesis == |
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Initially in [[spermatogenesis]], a [[spermatogonium]] divides by [[mitosis]] into two so-called ''primary spermatocytes''. A primary spermatocyte is also diploid, and, in turn, gives place by [[meiosis]] to two ''secondary spermatocytes'', which this time are [[haploid]]. The two secondary spermatocytes undergo a second meiotic division thereby expelling half the amount of [[chromosomes]] to form 4 haploid cells called [[spermatids]]. The spermatids mature into sperm cells, who travel through the seminiferous tubules to mature further in the [[epididymis]]. |
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== Anatomy == |
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The sperm cell consists of a head, a midpiece and a tail. The head is the [[nucleus]] with densely coiled cromatinfibres, surrounded anteriorly by an [[acrosome]], which contains enzymes used for penetrating the female egg. The midpiece has a central milamentous core with many mitochondria spiralled around it, used for ATP production for the journey through the female [[cervix]], [[uterus]] and [[uterine tubes]]. The tail or "[[flagellum]]" executes the lashing movements that propel the spermatocyte, and it consists of microtubules in an extension of the cell membrane. |
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== Maturization== |
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A sperm cell is not motile as it reaches the epididymis. It is transported through the epididymis by [[peristalsis]], and as it reaches the end of this 6 meters long tube, it is a fully functional sperm cell ready for ejaculation. |
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Revision as of 09:46, 21 June 2008
The sperm cell is the male cell used for procreation. It is a haploid, so that the its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell with 46 chromosomes.
Spermatogenesis
Initially in spermatogenesis, a spermatogonium divides by mitosis into two so-called primary spermatocytes. A primary spermatocyte is also diploid, and, in turn, gives place by meiosis to two secondary spermatocytes, which this time are haploid. The two secondary spermatocytes undergo a second meiotic division thereby expelling half the amount of chromosomes to form 4 haploid cells called spermatids. The spermatids mature into sperm cells, who travel through the seminiferous tubules to mature further in the epididymis.
Anatomy
The sperm cell consists of a head, a midpiece and a tail. The head is the nucleus with densely coiled cromatinfibres, surrounded anteriorly by an acrosome, which contains enzymes used for penetrating the female egg. The midpiece has a central milamentous core with many mitochondria spiralled around it, used for ATP production for the journey through the female cervix, uterus and uterine tubes. The tail or "flagellum" executes the lashing movements that propel the spermatocyte, and it consists of microtubules in an extension of the cell membrane.
Maturization
A sperm cell is not motile as it reaches the epididymis. It is transported through the epididymis by peristalsis, and as it reaches the end of this 6 meters long tube, it is a fully functional sperm cell ready for ejaculation.