At approximately day 1

Urogenital sinus arises.

Reference [PubMed Link]

Marker PC, Donjacour AA, Dahiya R, Cunha GR. 2003. Hormonal, cellular, and molecular control of prostatic development. Dev Biol 253(2):165-174.

At approximately day 1

The tunica albuginea (surronding the testes) forms by week 7.

Reference

Moore KL, Persaud TVN. 1998. The Developing Human: Clinically Oriented Embryology. 6th ed. Philadelphia: WB Saunders Co.

At approximately day 1

Gubernaculum condenses, pulling the testes toward the deep inguinal ring (by week 12).

Duration: 5 weeks

Reference

Larsen WJ. 1997. Human Embryology. New York: Churchill Livingstone Inc.

At approximately day 1

Sertoli cells aggregate to form testicular cords (seminiferous tubules) which enclose germ cells.

Duration: 1 week

Reference [PubMed Link]

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.

At approximately day 2

A basal lamina which surrounds the testicular cords is detectable.

Reference [PubMed Link]

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.