Trapezius

Definition

The trapezius is a large triangular muscle that extends over the back of the neck and shoulders, and is involved in moving, rotating, and stabilizing the scapula (shoulder blade) and extending the neck. It is one of the major muscles of the pectoral girdle and upper limbs, facilitating movement and support for arm and shoulder activities.

Related terms

Scapula:

A flat triangular bone located on each side of the upper back, serving as an important attachment site for multiple muscles including the trapezius.

Muscle contraction: The process through which muscles produce force or motion by shortening their fibers in response to neural stimulation; essential for all voluntary movements performed by muscles like the trapezius.

Pectoral Girdle:

The set of bones that provide attachment points for muscles moving the upper limbs; includes clavicles (collarbones) and scapulae (shoulder blades), supporting structures connected with muscles such as the trapezius