The anatomy of thoracic outlet structures is complex in several ways. First, many of the bones are both origin and insertion for muscles. Second, several of the muscles have statistically significant variations in cadaver studies. Here, you will find a brief overview of Thoracic Outlet Syndrome followed by a walk-through of the structures from back […]
Overview Scalene anatomy is more variable than most muscles. They vary in their attachments and size in 40-71% of the reviewed studies. Scalenes are 3 (sometimes 4) muscles on either side of the neck. This is one of those muscles that makes it hard to say which end is the origin and which end is
The subclavius is a short, thick triangular muscle along the inferior aspect of the clavicle. Origin – first rib Insertion – medial clavicle. Function – lowers clavicle. The origin is a flat tendon that attaches on the first rib, near the sternal cartilage. It gradually transitions to muscle fibers. The insertion is a tendon that
Overview Pectoralis minor is a fan-shaped muscle in the front of the shoulder. Notably, its anatomy has frequent variations. Basically, it secures the coracoid process of the scapula to the rib cage. Superficially, the pectoralis major covers the pectoralis minor. Overview of Pectoralis Minor Anatomy Origin Insertion Function Innervation Anomalies are clinically significant on attachments and innervation.
