AOI Shoulder & Upper Back

Action for Trapezius

Scapular elevation/ retraction/ depression, AND upward rotation

Origin for Trapezius

Occipital bone and spinous process of C7 - lower thoracic vertebrae

Insertion for Trapezius

Clavicle & Scapular Spine

Action for Rhomboid (Minor & Major)

Retracts and elevates scapula

Origin for Rhomboid Minor

Spinous process of C7-T1

Origin for Rhomboid Major

Spinous process of T2-T5

Insertion for Rhomboid Minor

Medial boarder of scapula

Insertion for Rhomboid Major

Medial boarder of scapula

Action for Serratus Anterior

Scapular protraction, upward rotation

Origin of Serratus Anterior

Lateral surface of upper 8 ribs

Insertion for Serratus Anterior

Anterior surface of scapula

Action for Pectoralis Minor

Scapular depression, protraction, downward rotation, and tilt

Origin for Pectoralis Minor

Anterior surface, 3rd-5th ribs

Insertion of Pectoralis Minor

Scapula

Action of Pectoralis Major

Shoulder flexion AND extension: first 60 degrees

Origin of Pectoralis Major

Clavicle and sternum, costal cartilages of first 6 ribs

Insertion of Pectoralis Major

Lateral lip of humerus

Action of Deltoid

Shoulder abduction, flexion, medial rotation, horizontal adduction

Origin of Deltoid

Lateral 3rd of clavicle and scapula

Insertion of Deltoid

Humerus

Action of Latissimus Dorsi

Shoulder extension, adduction, medial rotation, hyperextension

Origin of Latissimus Dorsi

Spinous process of T7-L5, posterior surface of sacrum, iliac crest, lower 3 ribs

Insertion of Latissimus Dorsi

Medial groove of humerus

Action of Infraspinatus

Shoulder lateral rotation, horizontal abduction

Origin of Infraspinatus

Infrapsinous fossa of scapula

Insertion of Infraspinatus

Greater tubercle of humerus

Action of Teres Major

Shoulder extension, adduction, and medial rotation

Origin of Teres Major

Scapula

Insertion of Teres Major

Medial side of the head of the humerous