part of part of has muscle origin has muscle origin has muscle insertion has muscle insertion has muscle antagonist Homo sapiens femur ilium psoas major muscle iliacus muscle gluteus maximus http://upload.wikimedia.org/wikipedia/commons/7/70/Posterior_Hip_Muscles_3.PNG FMA:22314 Wikipedia:Gluteus_maximus_muscle The largest and most superficial of the three gluteal muscles [WP,unvetted]. MA:0002309 EMAPA:18527 SCTID:181674001 UMLS:C0224424 UBERON:0001370 NCIT:C52560 m.gluteus maximus gluteus superficialis gluteus maximus muscle In humans, it makes up a large portion of the shape and appearance of the buttocks. It is a broad and thick fleshy mass of a quadrilateral shape, and forms the prominence of the nates. Its large size is one of the most characteristic features of the muscular system in humans, connected as it is with the power of maintaining the trunk in the erect posture. The muscle is remarkably coarse in structure, being made up of fasciculi lying parallel with one another and collected together into large bundles separated by fibrous septa. glutæus maximus glutaeus maximus muscle musculus gluteus maximus psoas minor muscle gluteal muscle fused sacrum musculature of pelvic girdle iliofemoralis muscle