Posterior Scalene - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The posterior scalene is one of the scalene muscles of the neck. It is the smallest and the deepest of the scalene muscles. Attachments: Originates from the posterior tubercles of the transverse processes of C5-C7 and attaches into the second rib. Function: Elevation of the second rib, and ipsilateral lateral flexion of the neck. Innervation: Anterior rami of C6-C8. Blood Supply: Ascending cervical branch of inferior thyroid artery By TeachMeSeries Ltd (2026) 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 Frequent questions What is the posterior scalene muscle? The posterior scalene is the smallest and deepest muscle among the scalene group located in the neck. It plays a role in elevating the second rib and facilitating lateral flexion of the neck on the same side. Where does the posterior scalene muscle originate and insert? The posterior scalene originates from the posterior tubercles of the transverse processes of the cervical vertebrae C5 to C7 and inserts into the second rib. This anatomical positioning allows it to assist in rib elevation. What is the primary function of the posterior scalene? The primary function of the posterior scalene is to elevate the second rib during respiration and to enable ipsilateral lateral flexion of the neck. This muscle contributes to both breathing mechanics and neck mobility. How is the posterior scalene muscle innervated? The posterior scalene receives its nerve supply from the anterior rami of spinal nerves C6 to C8. This innervation is crucial for its motor function and coordination during neck movements. What is the blood supply for the posterior scalene muscle? The blood supply to the posterior scalene is primarily from the ascending cervical branch of the inferior thyroid artery. This vascular support ensures the muscle receives the necessary nutrients for functioning effectively. Rate This Article