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Spermatogonium

Translation
Spermatogonium

Infobox Anatomy
Name = Spermatogonium
Latin =
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Caption = Germinal epithelium of the testicle. 1 basal lamina, 2 spermatogonia, 3 spermatocyte 1st order, 4 spermatocyte 2nd order, 5 spermatid, 6 mature spermatid, 7 Sertoli cell, 8 tight junction (blood testis barrier)


Caption2 = Histological section through testicular parenchyma of a boar. 1 Lumen of Tubulus seminiferus contortus, 2 spermatids, 3 spermatocytes, 4 spermatogonia, 5 Sertoli cell, 6 Myofibroblasts, 7 Leydig cells, 8 capillaries
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MeshName = Spermatogonia
MeshNumber = A05.360.490.890.900
A spermatogonium (plural: "spermatogonia") is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa.

There are three subtypes:

*Type A(d) cells, with dark nuclei. These cells divide to produce copies of themselves, thereby ensuring a constant supply of spermatogonia to fuel spermatogenesis.

*Type A(p) cells, with pale nuclei. These cells divide by mitosis to produce Type B cells.
*Type B cells, which divide to give rise to "primary spermatocytes".

Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergo meiosis II to produce two spermatids (haploid). (1 primary spermatocyte => 4 spermatids)

The spermatids then undergo spermiogenesis to produce spermatozoa.


=Additional

ource

This article includes material from [http://www.biology-online.org/ Biology Online] .


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  • Spermatogonium — Sper ma*to*go ni*um, n. [NL., fr. Gr. ????, ???, sperm + ??? offspring.] (Physiol.) A primitive seminal cell, occuring in masses in the seminal tubules. It divides into a mass (spermosphere) of small cells (spermoblast), which in turn give rise… …   The Collaborative International Dictionary of English

  • spermatogonium — spermatogonium. См. сперматогоний. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Spermatogonium — Spermatogonien (Einzahl Spermatogonium oder Spermatogonie), auch Ursamenzellen, sind die Stammzellpopulation im sogenenannten Keimepithel des Hodens. Diese auf eine Entwicklung zu Samenzellen festgelegten gewebsspezifischen Stammzellen entstehen… …   Deutsch Wikipedia

  • spermatogonium — noun (plural spermatogonia) Etymology: New Latin Date: 1861 a primitive male germ cell • spermatogonial adjective …   New Collegiate Dictionary

  • spermatogonium — n.; pl. ia [Gr. sperma, seed; gonos, offspring] The gonads of male animals that give rise to the spermatocytes …   Dictionary of invertebrate zoology

  • spermatogonium — Plant gonad cell that undergoes repeated mitoses, leading to the production of spermatocytes …   Dictionary of molecular biology

  • spermatogonium — spermatogonial, adj. /sperr mat euh goh nee euhm, sperr meuh teuh /, n., pl. spermatogonia / nee euh/. Cell Biol. one of the undifferentiated germ cells giving rise to spermatocytes. [1860 65; < NL; see SPERMATO , GONIUM] * * * …   Universalium

  • spermatogonium — noun Any of the undifferentiated cells in the male gonads that become spermatocytes; a spermatoblast …   Wiktionary

  • spermatogonium — The primitive sperm cell derived by mitotic division from the germ cell; increasing several times in size, it becomes a primary spermatocyte. SEE ALSO: spermatid. SYN: spermatoblast, spermatogone …   Medical dictionary

  • spermatogonium — сперматогоний Диплоидная мужская половая клетка, претерпевающая ряд митотических делений (в среднем 3 6) на первом этапе сперматогенеза …   Англо-русский толковый словарь генетических терминов