Once the corpus luteum regresses the remnant is known as corpus albicans. This tissue undergoes convergent extension as the primitive streak regresses, or as the embryo gastrulates. The tissue undergoes convergent extension as the primitive streak regresses, or as the embryo gastrulates. It regresses and disappears about the time of sexual maturity. Emanuel hypnotically regresses Tina and plays a recording for Paul. After birth, the ductus arteriosus regresses to form the ligamentum arteriosum. Gynecomastia induced by spironolactone usually regresses after a few weeks following discontinuation of the medication. As development proceeds, one of the pairs of ducts develops while the other regresses. When flustered, Hyacinth regresses to her native Northern accent for a while. In post modern human civilization, technology regresses back to middle age level. The anterior sacral meningocele regresses over time following transdural ligation of its neck. She mentally regresses to the state of a child. Usually, the duct of the dorsal bud regresses, leaving the main pancreatic duct. But he is defeated by Finn, and he regresses back to his weakened state. This condition is also one of the few that unexpectedly stops and regresses.