part of part of innervated by innervated_by has muscle origin has muscle origin has muscle insertion has muscle insertion neural spine rib iliocostalis muscle http://upload.wikimedia.org/wikipedia/commons/8/89/Iliostalis.png FMA:77177 musculus iliocostalis iliocostal muscle UBERON:0002251 The iliocostalis is the muscle immediately lateral to the longissimus that is the nearest to the furrow that separates the epaxial muscles from the hypaxial. It lies very deep to the fleshy portion of the serratus ventralis (serratus anterior). [WP,unvetted]. lateral column of erector spinae NCIT:C32763 iliocostalis UMLS:C0224304 EMAPA:37603 SCTID:244854008 MA:0002319 Wikipedia:Iliocostalis erector spinae muscle group fused sacrum muscle of vertebral column dorsal ramus of spinal nerve