All of the fibers insert on the medial lip of the intertubercular groove of the humerus. This large muscle of the back originates from the lower six and all the lumbar vertebrae as well as the iliac crest via the thoracolumbar fascia.

The trapezius will be targeted with the deltoids. Individually, the superior elevation the scapula, the middle fibers retraction the scapula, and the inferior fibers depress the scapula. All of these fibers insert on the lateral third of the clavicle, acromion process and spine of the scapula.Īs a whole, the trapezius upwardly rotates the scapula. The trapezius as a whole originates from the external occipital protuberance, ligamentum nuchae (the ligament of the back of the neck), and spinous processes of the last cervical and all thoracic vertebrae. Because of the many origins/connections of the trapezius, each of these areas of fibers performs a different action. It is divided into three different groups: the superior fibers, middle fibers and inferior fibers. The trapezius is the easily distinguishable superior muscle of the neck/back.

There are also three smaller muscles, which lie deep to the trapezius and latissimus dorsi, which assist these larger muscles. These two prominent superficial muscles together extend from the skull all the way down to the sacrum and illium. They are the trapezius and latissimus dorsi. There are two large muscles that cover almost the entire back. Structure & Function: Muscles Of The Back

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