Testicular descent

(A) The testes appear on the urogenital ridge (second month).
(B) The coelomic cavity evaginates into the scrotal swelling where it forms the processus vaginalis (middle of the third month).
(C) Testes begin descent into the scrotum guided by the gubernaculum (seventh month).
(D) The processus vaginalis obliterates spontaneously (shortly after birth).