精子細胞
WordNet
- an immature gamete produced by a spermatocyte; develops into a spermatozoon
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/04/05 04:42:54」(JST)
[Wiki en表示]
| Spermatid |
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)
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Transverse section of a tubule of the testis of a rat. × 250.
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| Identifiers |
| Gray's |
p.1243 |
| MeSH |
A05.360.490.890.860 |
| Anatomical terminology |
The spermatid is the haploid male gametid that results from division of secondary spermatocytes. As a result of meiosis, each spermatid contains only half of the genetic material present in the original primary spermatocyte.
Spermatids are connected by cytoplasmic material and have superfluous cytoplasmic material around their nuclei.
When formed, early round spermatids must undergo further maturational events to develop into spermatozoa, a process termed spermiogenesis (also termed spermeteliosis).
The spermatids begin to grow a living thread, develop a thickened mid-piece where the mitochondria become localised, and form an acrosome. Spermatid DNA also undergoes packaging, becoming highly condensed. The DNA is packaged firstly with specific nuclear basic proteins, which are subsequently replaced with protamines during spermatid elongation. The resultant tightly packed chromatin is transcriptionally inactive.
Additional images
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Scheme showing analogies in the process of maturation of the ovum and the development of the Genyo spermatids (young spermatozoa).
External links
- Histology image: 17804loa — Histology Learning System at Boston University - "Male Reproductive System: testis, early spermatids"
- Histology image: 17805loa — Histology Learning System at Boston University - "Male Reproductive System: testis, late spermatids"
- Histology at okstate.edu
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Male reproductive system
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| Internal |
| Seminal tract |
| Testes |
- layers
- Tunica vaginalis
- Tunica albuginea
- Tunica vasculosa
- Appendix
- Mediastinum
- Lobules
- Septa
- Leydig cell
- Sertoli cell
- Blood–testis barrier
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| Spermatogenesis |
- Spermatogonium
- Spermatocytogenesis
- Spermatocyte
- Spermatidogenesis
- Spermatid
- Spermiogenesis
- Spermatozoon
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| Other |
- Seminiferous tubules
- Tubuli seminiferi recti
- Rete testis
- Efferent ducts
- Epididymis
- Paradidymis
- Spermatic cord
- Vas deferens
- Ejaculatory duct
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| Accessory glands |
- Seminal vesicles
- Prostate
- Urethral crest
- Seminal colliculus
- Prostatic utricle
- Ejaculatory duct
- Prostatic sinus
- Prostatic ducts
- Bulbourethral glands
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| External |
| Penis |
- root
- Crus
- Bulb
- Fundiform ligament
- Suspensory ligament
- body
- Corpus cavernosum
- Corpus spongiosum
- glans
- fascia
- Tunica albuginea
- Septum of the penis
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| Urinary tract |
- Internal urethral orifice
- Urethra
- Prostatic
- Intermediate
- Spongy
- Navicular fossa
- External urethral orifice
- Lacunae of Morgagni
- Urethral gland
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| Scrotum |
- layers
- skin
- Dartos
- External spermatic fascia
- Cremaster
- Cremasteric fascia
- Internal spermatic fascia
- Perineal raphe
- Scrotal septum
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Index of reproductive medicine
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| Description |
- Anatomy
- Physiology
- Development
- sex determination and differentiation
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| Disease |
- Infections
- Congenital
- Neoplasms and cancer
- male
- female
- gonadal
- germ cell
- Other
- Symptoms and signs
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| Treatment |
- Procedures
- Drugs
- benign prostatic hypertrophy
- erectile dysfunction and premature ejaculation
- sexual dysfunction
- infection
- hormones
- androgens
- estrogens
- progestogens
- GnRH
- prolactin
- Assisted reproduction
- Birth control
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UpToDate Contents
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- 1. 男性不妊症の治療 treatment of male infertility
- 2. 男性生殖生理学 male reproductive physiology
English Journal
- Testicular toxicity of methyl thiophanate in the Italian wall lizard (Podarcis sicula): morphological and molecular evaluation.
- Cardone A.SourceDepartment of Biological Science, Section of Evolutionary and Comparative Biology, University of Naples Federico II, Via Mezzocannone, 8, 80134, Naples, Italy, anna.cardone@unina.it.
- Ecotoxicology (London, England).Ecotoxicology.2012 Mar;21(2):512-23. Epub 2011 Nov 5.
- The effects of the fungicide methyl thiophanate (MT) on testis were determined in the Italian wall lizard (Podarcis sicula) using morphological and molecular analyzes. Three experimental trials were performed: an acute test using six doses, a two-week chronic test, and "ecotoxicological" exposure (3
- PMID 22057426
- ABCA17 mediates sterol efflux from mouse spermatozoa plasma membranes.
- Morales CR, Ni X, Smith CE, Inagaki N, Hermo L.SourceDepartment of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada. carlos.morales@mcgill.ca
- Histology and histopathology.Histol Histopathol.2012 Mar;27(3):317-28.
- Mammalian spermatozoa lose plasma membrane cholesterol during maturation in the epididymis and during capacitation in the female reproductive tract. While cholesterol acceptors such as high-density lipoproteins (HDL) and apolipoproteins A-I (apoA-I) and J (Apo J) have been found in male and female r
- PMID 22237709
Japanese Journal
- Accumulated HSV1-TK Proteins Interfere with Spermatogenesis through a Disruption of the Integrity of Sertoli-Germ Cell Junctions
- CAI Li-Yi,KATO Takako,CHEN Mo [他],WANG HongHua,SEKINE Ei-ichiro,IZUMI Shun-ichiro,KATO Yukio
- The Journal of reproduction and development 58(5), 544-551, 2012-10-01
- … Transgenic rats show spermatid-specific ectopic expression of the reporter gene, herpes simplex virus type1 thymidine kinase (HSV1-TK), in the testes and have demonstrated male infertility. …
- NAID 10031123298
- 顕微鏡下精巣内精子回収術(Microdissection testicular sperm extraction : MD-TESE)により精子を回収し得たY染色体常染色体転座の1例
- 湯村 寧,村瀬 真理子,片山 佳代 [他],千木野 みわ,相澤 佳乃,黒田 晋之介,野口 和美
- 泌尿器科紀要 58(6), 307-310, 2012-06-00
- … Seminiferous epithelium showed maturation arrest at the stage of spermatid. …
- NAID 40019323435
Related Links
- The spermatid is the haploid male gametid that results from division of secondary spermatocytes. As a result of meiosis, each spermatid contains only half of the genetic material present in the original primary spermatocyte. Spermatids are ...
Related Pictures
![HLS [ Male Reproductive System, testis, late spermatids] HIGH MAG](https://1mg.info/0/u/1/1017.jpg)
★リンクテーブル★
[★]
- 英
- spermatid (Z)
- ラ
- spermatidium
- 同
- 精細胞
- 関
- 曲精細管、精子形成、成熟性細胞
[★]
- 英
- spermatid、sperm cell
- 関
- 精子細胞
[★]
- 関
- spermatid