Aromatase and ERβ in Sertoli, Leydig and germ cells; no evidence of ERα through week 24.
Duration: 11 weeks
Boukari K, Ciampi ML, Guiochon-Mantel A, Young J, Lombes M, Meduri G. 2007 Jul. Human fetal testis: source of estrogen and target of estrogen action. Hum Reprod 22(7):1885-92.
Approximately 70 primary ducts are evident, some of which exhibit secretory cytodifferentiation.
Cunha GR, Donjacour AA, Cooke PS, Mee S, Bigsby RM, Higgins SJ, Sugimura Y. 1987. The endocrinology and developmental biology of the prostate. Endocr Rev 8:338-362.
Testosterone production peaks.
Duration: 2 weeks
Larsen WJ. 1997. Human Embryology. New York: Churchill Livingstone Inc.
Testis weight is approximately 12 mg.
Rabinovici J, Jaffe RB. 1990. Development and regulation of growth and differentiated function in human and subhumand primate fetal gonads. Endocrine Reviews 11(4):532-557.