Gubernaculum

The paired gubernacula (from Ancient Greek κυβερνάω = pilot, steer) also called the caudal genital ligament, are embryonic structures which begin as undifferentiated mesenchyme attaching to the caudal end of the gonads (testes in males and ovaries in females).
Structure.
The gubernaculum is present only during the development of the urinary and reproductive organs. It is later replaced by distinct vestiges in males and females.
Development.
As the scrotum and labia majora form in males and females respectively, the gubernaculum aids in the descent of the gonads (both testes and ovaries).
The testes descend to a greater degree than the ovaries and ultimately pass through the inguinal canal into the scrotum. The mechanism of this movement is still debated.
History.
The gubernaculum was first described by John Hunter in 1762. The term comes from Ancient Greek meaning to steer, or the rudder or helm.