The Trapezius EXPLAINED | Origin, Insertion, Action, & More

The video tutorial explains the anatomy and functions of the trapezius muscle, which is divided into upper, middle, and lower parts. Each part has distinct origins, insertions, and actions. The upper trapezius is involved in scapular elevation and neck movements, the middle trapezius in scapular retraction, and the lower trapezius in scapular depression. The video also covers scapular rotation, highlighting the roles of the upper and lower trapezius and the serratus anterior in upward rotation, while the rhomboids and levator scapulae contribute to downward rotation.

How do the fibers of the middle trapezius run?

What is the role of the upper trapezius in scapular movement?

Identify the major upward rotators of the scapula.