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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, with dark nuclei. These cells replicate to ensure 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 images Transverse section of a tubule of the testis of a rat. X 250. Schematic diagram of Spermatocytogenesis Source This article includes material from Biology Online. v • d • e Male reproductive system (TA A09.3-4, GA 11.1236) Internal Seminal tract Testes layers (Tunica vaginalis, Tunica albuginea, Tunica vasculosa testis) · Appendix · Mediastinum · Lobules · Septa · Leydig cell · Sertoli cell · Blood-testis barrier Spermatogenesis Spermatogonium · Spermatocytogenesis · Spermatocyte · Spermatidogenesis · Spermatid · Spermiogenesis · Spermatozoon Other Seminiferous tubules (Tubuli seminiferi recti, Rete testis, Efferent ducts) · Epididymis  (Appendix, Stereocilia) · Paradidymis · Spermatic cord · Vas deferens (Ampulla) · Ejaculatory duct Accessory glands Seminal vesicles  (Excretory duct of seminal gland) Prostate  (Urethral crest/Seminal colliculus/Prostatic utricle/Ejaculatory duct, Prostatic sinus/Prostatic ducts) Bulbourethral glands External 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 Urinary tract Internal urethral orifice · Urethra (Prostatic, Intermediate, Spongy, Navicular fossa) · External urethral orifice · Lacunae of Morgagni · Urethral gland Scrotum layers (skin, Dartos, External spermatic fascia, Cremaster/Cremasteric fascia, Internal spermatic fascia) · Perineal raphe M: ♂ MRS anat/phys/devp noco/cong/tumr, sysi/epon proc, drug (G3B/4C) This cell biology article is a stub. You can help Wikipedia by expanding it. v • d • e