Editing Spermatogenesis (section)

==Germ Cell Types==
*'''13 recognizable germ cell types:'''
*#'''Dark type A spermatogonia (Ad)'''
*#'''Pale type A spermatogonia (Ap)'''
*#'''Type B spermatogonia (B)'''
*#'''Preleptotene primary spermatocytes (R)'''
*#'''Leptotene primary spermatocytes (L)'''
*#'''Zygotene primary spermatocytes  (Z)'''
*#'''Pachytene primary spermatocytes (P)'''
*#'''Secondary spermatocytes (II)'''
*#'''Sa, Sb, Sc, Sd1, Sd2 spermatids'''

*'''Type A spermatogonia are the only true stem cell in the testis because they can either self-renew or differentiate to become sperm'''
*'''Total time to produce an ejaculated sperm ranges from 42 to 76 days, the majority of which is spent in the testicle'''
**Sperm spend 45 to 60 days developing in the testis and 2 to 12 days in the epididymis. They are not routinely found in the seminal vesicle, and spend only seconds in the ejaculatory ducts and urethra during ejaculation.