gubernaculum

https://doi.org/10.1351/goldbook.10785

Fetal mesenchyme ligament that passes through the anterior abdominal wall and connects the lower pole of each developing gonad with the developing scrotum in men, and with the developing labia majora in women.

Note: In men, it guides descent of the testes into the scrotum.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 762 (https://doi.org/10.1515/pac-2015-1202)