Spermatogonium, Spermatogonium Information, Spermatogonium Wiki


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Spermatogonium

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)

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
Gray\'s	subject #258 1243
MeSH	Spermatogonia

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 have dark nuclei and they divide to produce copies of themselves, thereby ensuring a constant supply of spermatogonia to fuel spermatogenesis.

Type A(p) cells have pale nuclei and they divide by mitosis to produce
- Type B cells and these Type B cells divide again 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 spermatocytes => 4 spermatids)

The spermatids then undergo spermiogenesis to produce spermatozoa.

Additional images

Gray1150.png

Transverse section of a tubule of the testis of a rat. X 250.

Spermatocytogenesis.png

Schematic diagram of Spermatocytogenesis

Source

This article includes material from Biology Online.

This cell biology article is a stub. You can help Wikipedia by expanding it.

v • d • e Male reproductive system
Scrotum	layers (skin, Dartos, External spermatic fascia, Cremaster/Cremasteric fascia, Internal spermatic fascia) • Perineal raphe • Spermatic cord
Testes	layers (Tunica vaginalis, Tunica albuginea) • Appendix • Mediastinum • Lobules • Septa • Leydig cell • Sertoli cell • Blood-testis barrier
Spermatogenesis	Spermatogonium • Spermatocytogenesis • Spermatocyte • Spermatidogenesis • Spermatid • Spermiogenesis • Spermatozoon
seminal tract	Seminiferous tubules (Tubuli seminiferi recti, Rete testis, Efferent ducts) • Epididymis (Appendix) • Vas deferens (Ampulla) • Ejaculatory duct
urinary tract	Internal urethral orifice • Urethra (Prostatic, Intermediate, Spongy, Navicular fossa) • External urethral orifice
accessory glands	Seminal vesicles (Excretory duct of seminal gland) • Prostate (Urethral crest/Seminal colliculus/Prostatic utricle/Ejaculatory duct, Prostatic sinus/Prostatic ducts) • Bulbourethral glands
Penis	root (Crus, Bulb, Fundiform ligament, Suspensory ligament) • body (Corpus cavernosum, Corpus spongiosum) • glans (Foreskin, Frenulum, Corona) • fascia (superficial/subcutaneous, deep/Buck\'s) • Tunica albuginea - Septum of the penis

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