human_reference_atlas Homo sapiens scalenus medius https://upload.wikimedia.org/wikipedia/commons/f/fa/Scalenus_medius.png SCTID:244844009 AS NCIT:C52986 medial scalene muscle UBERON:0001122 MA:0002370 scalenus medius muscle EMAPA:37738 FMA:13386 musculus scalenus medius uberon scalenus medius muscle musculus scalenus medius UMLS:C0224174 Wikipedia:Scalenus_medius The Scalenus medius, the largest and longest of the three scalene muscles, arises from the posterior tubercles of the transverse processes of the lower six cervical vertebræ. It descendes along the side of the vertebral column to insert by a broad attachment into the upper surface of the first rib, between the tubercle and the subclavian groove. The brachial plexus and the subclavian artery pass anterior to it. Because it elevates the upper ribs, the middle scalene muscle is also one of the accessory muscles of respiration. [WP,unvetted]. scalenus medius muscle middle scalene muscle of neck lateral vertebral muscle