Flexor/extensor region of arm

Coracobrachialis - Origin

Coracoid process of scapula

Coracobrachialis - Insertion

Middle third of medial humerus

Coracobrachialis - Peripheral Innervation

Musculocutaneous nerve

Coracobrachialis - Action

Assists in shoulder flexion and adduction; adds stability to GH joint.

Biceps Brachii - Origin

Short Head: Coracoid process of scapula; Long Head: Supraglenoid tubercle of scapula

Biceps Brachii - Insertion

Tuberosity of radius and (fascia of forearm via) bicipital aponeurosis

Biceps Brachii - Peripheral Innervation

Musculocutaneous nerve

Biceps Brachii - Segmental Innervation

C5, C6, C7

Biceps Brachii - Action

Forearm supination; elbow flexion especially when forearm is supinated; short head adds stability to GH joint.

Brachialis - Origin

Distal portion of anterior surface of humerus

Brachialis - Insertion

Coronoid process and tuberosity of ulna

Brachialis - Peripheral Innervation

Musculocutaneous and Radial Nerve

Brachialis - Action

Elbow flexion (independent of forearm position)

Triceps Brachii - Origin

Long Head: Infraglenoid tubercle of scapula; Lateral Head: posterior surface of humerus, superior to radial groove; Medial Head: Posterior surface of humerus, inferior to radial groove

Triceps Brachii - Insertion

Olecranon of ulna

Triceps Brachii - Peripheral Innervation

Radial Nerve

Triceps Brachii - Segmental Innervation

C6, C7, C8

Triceps Brachii - Action

Elbow extension, shoulder extension, long head stabilizes GH joint during abduction.