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Interstitial cells , also known as "Leydig Cells", are cells present in the male testes. They secrete androgens (e.g. testosterone) that support spermatogenesis and develop and maintain secondary male sex characteristics. Interstitial cells are secreted when the testes are stimulated by luteinizing hormone (LH), also called Interstitial Cell Stimulating Hormone (ICSH), which is released by the anterior lobe of the pituitary gland. This hormone, a glycoprotein, is released from the pituitary gland once the hypothalamus releases GnRF (Gonanotropic Releasing Factor). (NOTE: See "Leydig Cells"; I'm not sure how to combine the two terms together on Wikipedia). To meet Wikipedias quality standards, this article or section may require cleanup. ...