The testes, at an early period of foetal life, are placed at the back part of the abdominal cavity, behind the peritoneum, and each is attached by a peritoneal fold, the mesorchium, to the mesonephros.
Mesorchium is the fibrous sheath which attaches vascular and avascular structures of spermatic cord together.
This article incorporates text in the public domain from page 1207 of the 20th edition of Gray's Anatomy (1918)
