Muscles of the Shoulder Complex

Group 1Skeleton to Humerus

Latissimus DorsiPectoralis Major

Group 2 – Scapula to Humerus

• Deltoid

• Teres Major

• Biceps

• Triceps

• Rotator Cuff

– Supraspinatus

– Infraspinatus

– Teres Minor

– Subscapularis

Rotator Cuff

“SITS”

SUPRASPINATUS

INFRASPINATUSTERES MINOR

SUBSCAPULARIS

Biceps Brachii

Origin short head: coracoid process of thescapula. long head: supraglenoid tubercle

Insertion radial tuberosity and bicipitalaponeurosis into deep fascia on medial part of forearm

Nerve Musculocutaneous nerve (C5–C6)

Actions flexes elbow and supinates forearm

Antagonist Triceps brachii muscle

Triceps BrachiiOrigin long head: infraglenoid

tubercle of scapulalateral head: above the radial sulcusmedial head: below the radial sulcus

Insertion olecranon process of ulna

Actions extends forearm, long head extends shoulder

Group 3 – Skeleton to Scapula

• Levator Scapula

• Rhomboids (Major & Minor)

• Serratus Anterior

• Trapezius