Scaleneus Muscle
The scalenus medius muscle(m.scalenus medius) is the largest scalene muscle. It originates from the anterior tubercles of the transverse processes of all the cervical vertebrae and is attached to the first rib behind the sulcus of the subclavian artery. Innervation:C2-8The scalenus posterior muscle (m.scalenus posterior) arises from the posterior tubercles of the three lower cervical vertebrate and is attached to the outer surface of the second rib.Innervation :C2-8Action.The scalene muscles raise the upper ribs and act as muscles of inspiration. When the ribs are steadied bilateral contraction of the muscles accomplish forwards flexionthey flex and rotate Medical Billing Training will teach all these.
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