Middle Scalene, Anterior View

Description

Arising from the posterior tubercles of the transverse processes of the mid cervical vertebrae, the scalenus medius descends as a tall, straplike muscle along the lateral neck. From an anterior perspective, its belly sits posterior to the sternocleidomastoid and lateral to the cervical vertebral column, with the scalene triangle forming between it and the scalenus anterior. Inferiorly, its fibers converge toward the first rib, where the muscle inserts just posterior to the scalene tubercle. Clinically, this relationship to the brachial plexus roots and trunks and the subclavian artery matters, since both pass between the anterior and middle scalene and can be compressed in thoracic outlet syndrome, often worsened by scalene hypertrophy, spasm, or fibrous bands. The view also supports safe orientation for procedures that reference the interscalene groove, including ultrasound guided interscalene brachial plexus block and surgical exposure in the lower neck. A tight corridor. Educators can place this illustration in head and neck anatomy modules, regional anesthesia teaching files, or surgical atlases discussing supraclavicular approaches and first rib relations, where learners need a clear anterior map of what lies superficial and what lies deep. It also suits clinical handouts explaining scalenes in cervicobrachial pain patterns and differential diagnosis from cervical radiculopathy. Anatomical accuracy verified by SciePro's Medical Advisory Board.