Which scalene muscle is located anteriorly?

The anterior scalene muscle is positioned at the front of the scalene muscle group in the neck. This muscle originates from the transverse processes of the cervical vertebrae (C3 to C6) and inserts onto the first rib. Its primary functions include aiding in the elevation of the first rib during respiration and assisting with neck flexion and lateral bending.

This muscle’s anterior location is crucial for its role in respiration, as it helps expand the thoracic cavity by lifting the first rib. Additionally, it serves as an important landmark in the neck, as the brachial plexus and subclavian artery pass between the anterior and middle scalene muscles. Understanding the anterior scalene's placement and function is vital for grasping the anatomical relationships and physiological mechanics of the neck and thorax.