Spermatid
Translation- Spermatid
Infobox Anatomy
Name = Spermatid
Latin =
GraySubject = 258
GrayPage = 1243
Caption = "Germinal epithelium of thetesticle ."
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 = Transverse section of atubule of thetestis of arat . X 250.
System =
MeshName = Spermatids
MeshNumber = A05.360.490.890.860
The term spermatid refers to thehaploid malegametid that results from division of secondaryspermatocyte s. As a result ofmeiosis , each spermatid contains only half of the genetic material present in the original primary spermatocyte.Spermatids are connected together by cytoplasmic material and have superfluous cytoplasmic material around their nuclei.
When formed, "early round spermatids" must undergo further maturational events in order to develop into
spermatozoa , a process termedspermiogenesis (also termed "spermeteliosis").The spermatids begin to grow a tail, develop a thickened mid-piece where the
mitochondria become localised and form anacrosome . Spermatid DNA also undergoes packaging, becoming highly condensed. The DNA is packaged firstly with specific nuclear basic proteins, which are subsequently replaced withprotamines during spermatid elongation. The resultant tightly packedchromatin is transcriptionally inactive.
=AdditionalExternal links
* - "Male Reproductive System: testis, early spermatids"
* - "Male Reproductive System: testis, late spermatids"
* [http://www.cvm.okstate.edu/instruction/mm_curr/histology/MR/HiMRp3.htm Histology at okstate.edu]
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Look at other dictionaries:
spermatid — spermatid. См. сперматида. (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.
spermatid — noun Date: 1889 one of the haploid cells that are formed by the second division in meiosis of a spermatocyte and that differentiate into spermatozoa … New Collegiate Dictionary
spermatid — n. [Gr. sperma, seed] One of four haploid cells of the male after the meiotic divisions; an immature spermatozoon … Dictionary of invertebrate zoology
spermatid — /sperr meuh tid/, n. Cell Biol. one of the cells that result from the meiotic divisions of a spermatocyte and mature into spermatozoa. [1885 90; SPERMAT + ID3] * * * … Universalium
spermatid — noun A haploid cell, produced by meiosis of a spermatocyte, that develops into a spermatozoon … Wiktionary
spermatid — A cell in a late stage of the development of the spermatozoon; it is a haploid cell derived from the secondary spermatocyte and evolves by spermiogenesis into a spermatozoon. SYN: nematoblast. [spermat + id (2)] … Medical dictionary
spermatid — сперматида Гаплоидная клетка, образующаяся в результате II деления мейоза у самцов; в процессе спермиогенеза С. превращается в сперматозоид … Англо-русский толковый словарь генетических терминов
Сперматида (Spermatid) — небольшая клетка со сферическим ядром, которая образуется в процессе сперматогенеза при делении сперматоцитов второго порядка. Сперматиды залегают во внутреннем одноминальном слое клеток Сертоли. В процессе спермиогенеза спермагиды превращаются в … Медицинские термины
STRBP — Spermatid perinuclear RNA binding protein, also known as STRBP, is a human gene.cite web | title = Entrez Gene: STRBP spermatid perinuclear RNA binding protein| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene Cmd=ShowDetailView… … Wikipedia
сперматида — spermatid сперматида. Гаплоидная клетка, образующаяся в результате II деления мейоза у самцов; в процессе спермиогенеза С. превращается в сперматозоид. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А … Молекулярная биология и генетика. Толковый словарь.