stapedial branch of posterior auricular artery stapedial branch of posterior auricular artery in human anatomy, the stapedial branch of posterior auricular artery, or stapedial artery for short, is a small artery supplying the stapedius muscle in the inner ear. stapedial branch of posterior auricular arterydetailsprecursoraortic arch 2sourceposterior auricular arteryidentifierslatinramus stapedius arteriae auricularis posteriorista98a12.2.05.041ta24409fma49638anatomical terminology structure in humans