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IOAN

Muscles of the shoulder

Muscle OriginInsertionActionInnervation
Anterior Deltoid lateral third of the clavicle deltoid tuberosity shoulder abduction flexion medial rotation, and horizontal adduction axillary nerve
Middle Deltoid acromion process deltoid tuberosity shoulder abduction axillary nerve
Posterior Deltoid spine of scapula deltoid tuberosity shoulder abduction, extension, hyperextension, lateral rotation horizontal abduction axillary nerve
Supraspinatus supraspinous fossa of scapula greater tubercle of humerus shoulder abduction suprascapular nerve
Infraspinatus infraspinous fossa of scapula greater tubercle of humerus shoulder lateral rotation and horizontal abduction suprascapular nerve
Teres Minor axillary border of scapula greater tubercle of humerus shoulder lateral rotation and horizontal abduction axillary nerve
Subscapularis Subscapular fossa of the scapula lesser tubercle shoulder medial rotation upper and lower subscapular nerve
Biceps Brachii (short head) Coracoid process of scapula Radial tuberosity of radius elbow flexion (bending elbow) and forearm supination (rotating palm to face up ) musculocutaneous nerve
Biceps Brachii (long head) supraglenoid tubercle of scapula Radial tuberosity of radius elbow flexion (bending elbow) and forearm supination (rotating palm to face up ) musculocutaneous nerve
Triceps (long head) infraglenoid tubercle of scapula olecranon process of ulna elbow extension (Straightening arm) radial nerve
Triceps (lateral head) inferior to greater tubercle on posterior humerus. olecranon process of ulna elbow extension (straightening arm) Radial Nerve
Pectoralis major medial third of the clavicle, sternum, and costal cartilage of first six ribs lateral lip of bicipital groove of humerus clavicular portion: shoulder flexion(lifting arm) to first 60 degrees Sternal portion shoulder extension first 60 degrees(arm starts by our side and pushes back) lateral and medial pectoral nerve.
Latissimus dorsi spinous processes of T7 through L5 (via thoracolumbar fascia) Posterior surface of the sacrum, iliac crest, Lower Three ribs Medial floor of bicipital groove of the humerus shoulder extension, medial rotation, hyper extension thoracodorsal nerve
Triceps (medial Head posterior surface of humorous olecranon processes of ulna elbow extension (straightening arm) radial nerve
Created by: j2dap595
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