Posterior Deltoid/Extension of the Shoulder

Muscle: Posterior Deltoid

Joint Location: Shoulder

Action: Extension of the Shoulder

Origin, Insertion, Action Muscle

 

Origin: Spine of the scapula


Insertion: Deltoid tuberosity of humerus


Action: Extension of the Shoulder; lateral rotation of the arm

muscles
Muscle Attachment Sites Muscle in Action

attachments

Agonist Muscles: Triceps, Teres Major, Latissimus Dorsi

Antagonist Muscles: Anterior Deltoid, Biceps Brachii, Pectoralis Major, Coracobrachialis