| Muscle | Innervation | Origin | Insertion | Action | Nerve Root | |
| 1 | Coracobrachialis | Musculocutaneous | Coracoid | mid.humerus medial | Flexion, adduction | C5,6,7 lat cord |
| 2 | Biceps | Musculocutaneous | Coracoid(SH), Supraglenoid (LH) | Radial tuberosity | Supination, flexion | C5,6 lat cord |
| 3 | Brachialis | Musculocutaneous-medial, radial lateral | Ant. Humerus | Ulnar tuberosity (ant) | Flexes forearm | C5,6 lat/post cord |
| 4 | Triceps | Radial | Infraglenoid(LH), Post.Humerus(lat H.), Post. Humerus (MH) | Olecranon | Extends forearm | C6,7,8,T1 post cord |