Spermatogonium
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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.
These germ cells can be divided into Type A, In (intermediate), and Type B Spermatogonia. Included in the Type A spermatogonia are a subset of cells from which all germ cells are derived; the spermatogonial stem cells.
Spermatogonia are the primitive differentiated male germ cells which give rise to primary spermatocytes, through the first meiotic division.
Spermatocytes are diploid cells which divide by a second round of meiosis to produce the haploid round and elongated spermatids and finally mature spermatozoa.
[edit] Additional images
Schematic diagram of Spermatocytogenesis |
[edit] Source
This article includes material from Biology Online.
fr:spermatogonie| Male reproductive system |
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| Scrotum : layers (skin, Dartos, External spermatic fascia, Cremaster, 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, Spermatocyte, Spermatid, Spermatozoon seminal tract: Seminiferous tubules (Tubuli seminiferi recti, Rete testis, Efferent ducts) | Epididymis (Appendix) | Vas deferens | Ejaculatory duct Seminal colliculus urinary tract: Internal urethral orifice | Urethra (Prostatic, Intermediate, Spongy) | Urethral crest | Urethral gland | External urethral orifice Penis: Corpus cavernosum | Corpus spongiosum | Navicular fossa of male urethra | Glans penis | Fundiform ligament | Suspensory ligament | Foreskin | Frenulum accessory glands: Seminal vesicles (Excretory duct of seminal gland) | Prostate (Prostatic utricle, Prostatic sinus) | Bulbourethral glands |
