Anatomy, Shoulder and Upper Limb, Deltoid Muscle

The deltoid muscle is a large triangular shaped muscle associated with the human shoulder girdle, explicitly located in the proximal upper extremity. The shoulder girdle is composed of the following osseous components Proximal humerus Scapula anatomic components of the scapula also include the glenoid, acromion, coracoid process Clavicle The shoulder girdle musculature, in addition to the deltoid muscle itself, includes the following Rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) Trapezius and other periscapular stabilizing muscles Triceps Latissimus dorsi Pectoralis major/minor The deltoid is composed of anterior (or clavicular fibers), lateral (or acromial fibers), and posterior (or spinal fibers).