part of part of has muscle origin has muscle origin has muscle insertion has muscle insertion contributes to morphology of system male reproductive system musculature muscle organ reproductive structure inguinal ligament tunica vaginalis testis cremaster muscle Wikipedia:Cremaster_muscle NCIT:C32396 A thin layer of skeletal muscle that envelops the spermatic cord and testis of most male mammals in a series of loops; it is a continuation of the obliquus internus, arising from the inguinal ligament and inserting into the crest of the pubis and into the sheath of the rectus abdominis; it is innervated by the genital branch of the genitofemoral nerve and functions to draw the testis up toward the superficial inguinal ring in response to cold or to stimulation of the nerve;. muscle of Riolan (cremaster) cremasteric muscle SCTID:244948006 FMA:21531 UBERON:0008488 muscle of Riolan EMAPA:31250 cremaster muscle cremaster