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Muscles that act on the arm

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Muscle
Attachment 1 (origin)
Attachment 2 (insertion)
Action 1
Action 2
Other actions
Innervation
Deltiod   Lateral clavicle, acromion process, and spine of the scapula   Deltoid tuberosity of the humerus   Anterior: flexion, horizontal adduction, and medial (internal) rotation of the arm   Middle: Abduction   Posterior: Extension, horizontal abduction, and lateral (external) rotation of the arm   Axillary Nerve  
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Pectoralis Major   Medial clavicle, sternum, and costal cartilages of ribs 1-7   Lateral lip of the bicipital groove of the humerus   Adduction of the arm   Horizontal adduction of the arm   Medial (internal) rotationof the arm, flexion of the arm, extension of the arm   Medial and lateral pectoral nerves  
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Coracobrachialis   Coracoid process of the scapula   Middle of the medial border of the humerus   Flexion of the arm   Adduction of the arm   Horizontal adduction   Musculocutaneous Nerve  
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Biceps Brachii   Supraglenoid tubercle and coracoid process of the scapula   Radial tuberosity   Forearm flexion   Forearm supination   Shoulder flexion   Musculocutaneous Nerve  
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Latissimus dorsi (the "lats")   Spinous processes of T7 to L5, posterior sacrum, posterior iliac crest   Medial lip of the bicipital groove of the humerus   Extension of the arm   Medial (internal) rotation of the arm   Adduction of the arm   Thoracodorsal Nerve  
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Teres major   Inferior lateral border of the scapula   Medial lip of the bicipital groove of the humerus   Medial (internal) rotation of the arm   Adduction of the arm   Extension of the arm   Lower Subscapular Nerve  
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Teres minor   Superior lateral border of the scapula   Greater tubercle of the humerus   Lateral (external) rotation of the arm   Extension of the arm     Axillary Nerve  
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Infraspinatus   Infraspinous fossa of the scapula   Greater tubercle of the humerus   Lateral (external) rotation of the arm   Extension of the arm     Suprascapular nerve  
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Triceps brachii   Infraglenoid tubercle of the scapula and posterior shaft of the humerus   Olecranon process of the ulna   Forearm extension   Shoulder extension     Radial Nerve  
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Subscapularis   Subscapular fossa of the scapula   Lesser tubercle of the humerus   Medial (internal) rotation of the arm       Upper and lower subscapular Nerves  
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Supraspinatus   Supraspinous fossa of the scapula   Greater tubercle of the humerus   Abduction of the arm       Suprascapular nerve  
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Brachialis   Distal 1/2 of the anterior shaft of the humerus   Ulnar tuberosity   Flexion of the forearm       Musculocutaneous Nerve  
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Anconeus   Lateral epicondyle of the humerus   Olecranon process of the ulna   Extension of the forearm       Radial Nerve  
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Brachioradialis   Lateral supracondylar ridge of the humerus   Styloid process of the radius   Forearm flexion       Radial Nerve  
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Pronator teres   Medial epicondyle of the humerus and coronoid process of the ulna   Lateral radius   Forearm pronation   Forearm flexion     Median Nerve  
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Pronator quadratus   Anterior distal ulna   Anterior distal radius   Pronation of the forearm       Median Nerve  
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Supinator   Lateral epicondyle of the humerus and the proximal ulna   Proximal 1/3 of the radius   Supination of the forearm       Radial Nerve  
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Created by: skpoem
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