mesorchium
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http://purl.obolibrary.org/obo/UBERON_0011879
The testes, at an early period of fetal 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. [ http://en.wikipedia.org/wiki/Mesorchium ]