part of part of ilium zone of bone organ iliac blade The extension of the ilium above the level of the acetabulum. Attachment site for both hindlimb and caudal musculature. Medially is the site of attachment of the sacral ribs, where these exist[PHENOSCAPE:ad]. wing of ilium wing of the ilium ala of ilium ilium ala FMA:42826 Wikipedia:Wing_of_ilium UBERON:0010746 SCTID:182024000