Trapezius

Musculus trapezius

A large, flat, triangular muscle of the upper back and neck. It originates from the external occipital protuberance, ligamentum nuchae, and spinous processes of C7-T12. It inserts on the lateral third of the clavicle, acromion, and spine of the scapula.

Type Muscle
Body System Muscular
Body Region Back
Latin Name Musculus trapezius
FMA ID 9626

Function

Elevates, retracts, and rotates the scapula. The upper fibers elevate the scapula, middle fibers retract it, and lower fibers depress and upwardly rotate it. Stabilizes the scapula during arm movements.

Clinical Significance

Trapezius weakness from spinal accessory nerve (CN XI) injury causes shoulder droop and difficulty with arm abduction above 90 degrees. Myofascial trigger points in the trapezius are a common cause of neck and shoulder pain.

Frequently Asked Questions

What is the Trapezius?
A large, flat, triangular muscle of the upper back and neck. It originates from the external occipital protuberance, ligamentum nuchae, and spinous processes of C7-T12. It inserts on the lateral third of the clavicle, acromion, and spine of the scapula.
What is the function of the Trapezius?
Elevates, retracts, and rotates the scapula. The upper fibers elevate the scapula, middle fibers retract it, and lower fibers depress and upwardly rotate it. Stabilizes the scapula during arm movements.
What body system is the Trapezius part of?
The Trapezius is part of the Muscular.
What conditions affect the Trapezius?
Trapezius weakness from spinal accessory nerve (CN XI) injury causes shoulder droop and difficulty with arm abduction above 90 degrees. Myofascial trigger points in the trapezius are a common cause of neck and shoulder pain.
Where is the Trapezius located?
The Trapezius is located in the Back region of the body.

Related Structures

anterior internodal tract anterior internodal fasciculus aponeurosis aponeuroses atrioventricular node A-V node Bachmann's bundle anterior interatrial band Biceps brachii Musculus biceps brachii bundle of His A-V bundle cardiac muscle tissue of myocardium cardiac Purkinje fiber cardiac Purkinje fiber

Medical Disclaimer

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