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]. [ https://github.com/obophenotype/uberon/issues/69 PHENOSCAPE:ad ]
Synonyms: wing of the ilium ilium ala ala ossis ilii a. ossis ilii wing of ilium ala of ilium