A bit about the early development of human gonads.
A few useful sources:
Sadler TW. 2014. Langman’s Medical Embryology. LWW. ISBN: 1451191642.
Everyone needs to have a copy of Langman’s around. Diagrams in the video were taken from this text.
Sajjad Y. 2010. Development of the genital ducts and external genitalia in the early human embryo. J Obstet Gynaecol Res. 36(5):929-37. doi: 10.1111/j.1447-0756.2010.01272.x.
A good review of the embryonic plumbing.
Zhao F, Franco HL, Rodriguez KF, Brown PR, Tsai MJ, Tsai SY, Yao HH. 2017. Elimination of the male reproductive tract in the female embryo is promoted by COUP-TFII in mice. Science 357(6352):717-720. doi: 10.1126/science.aai9136.
New stuff: a nice example of a female gene product that actively suppresses a male developmental feature.
I just so happen to have a copy of Langman’s Medical Embryology around here somewhere. It’s over there somewhere near the Netter Atlas.