Trapezius Muscle - Origin, Insertion, Actions - Human Anatomy | Kenhub

Hello, everyone! It’s Matt from Kenhub, and in this tutorial, we will discuss the

trapezius muscle.

The trapezius muscle is a triangular, flat muscle of the shoulder girdle.

It is supplied by the accessory nerve and the cervical plexus. Each of this pair of

symmetrical muscles differentiates into three parts.

The descending or superior part runs from the occipital bone and nuchal ligament to

the lateral third of the clavicle. The transverse or middle part originates from the spinal

processes of the first to fourth thoracic vertebrae and inserts at the acromion. And

the ascending or inferior part extends from the spinal processes of the fifth to twelfth

thoracic vertebrae to the scapular spine.

The trapezius stabilizes and secures the shoulder blade at the thorax and fulfills numerous

tasks. It moves the shoulder blade medially and rotates it outward. In addition, the descending

part causes elevation of the scapula while the ascending part depresses this bone.

Furthermore, a unilateral contraction bends the head to the ipsilateral side, known as

lateral flexion, whereas a bilateral contraction raises the head and the cervical vertebral

column, known as dorsal flexion.

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