in lateral side of innervated by innervated_by has muscle origin has muscle origin Homo sapiens muscle of pelvis coccygeus muscle http://upload.wikimedia.org/wikipedia/commons/6/63/Gray404.png Wikipedia:Coccygeus_muscle musculus coccygeus MA:0002277 FMA:19088 UBERON:0001327 ischiococcygeus The Coccygeus is a muscle of the pelvic wall (i.e. peripheral to the pelvic floor), situated behind the levator ani and in front of the sacrospinous ligament. It is a triangular plane of muscular and tendinous fibers, arising by its apex from the spine of the ischium and sacrospinous ligament, and inserted by its base into the margin of the coccyx and into the side of the lowest piece of the sacrum. It assists the Levator ani and Piriformis in closing in the back part of the outlet of the pelvis. [WP,unvetted]. EMAPA:37482 musculus ischiococcygeus coccygeus pelvic region of trunk ischial spine sacral nerve lateral structure