The middle scalene is one of the scalene muscles of the neck. It is the largest of the three scalene muscles and consists of several muscle bellies arising from the cervical spine. Attachments: Originates from the posterior tubercles of the transverse processes of C2-C7. It attaches onto the superior aspect of the 1st rib. Function:Â Elevation of the first rib. Ipsilateral contraction causes ipsilateral lateral flexion of the neck. Innervation: Anterior rami of C3-C8. Blood Supply: Ascending cervical branch of inferior thyroid artery By TeachMeSeries Ltd (2025) Fig 1The anterior, middle and posterior scalene muscles of the neck Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article