INTRODUCTION TO ANATOMY AND PHYSIOLOGY

Positions and Actions of Muscles – Shoulder Gridle

Muscle Name

Location

Action

Pectoralis major

front of the chest

Moves the arm towards the upper body

Deltoid

Covers the shoulder

Takes the arm away from the body in a sideways motion

Trapezius

Triangular muscle covering the back of the neck and upper back

Allows the head to move backwards

Leveator scapula

Runs vertically through the neck

Elevates the scapula

Rhomboids

Lies between the scapulae

Adducts the scapula

Infraspinatus

Attaches to the middle of the scapula

Rotates the humerus outwardly

Teres major

Attaches to the bottom end of the scapula and the back of the humerus

Adducts and inwardly rotates the humerus

Teres minor

Attaches to the lateral edge of the scapula

Rotates the humerus outwardly.

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