Muscles from 203 lectures 2023-24 Origins, insertions, actions and innervations
| Name | Brachialis |
| Origin | Medial and lateral surfaces of humerus shaft |
| Insertion | Ulnar tuberosity, distal to elbow joint |
| Action | Flexion at elbow |
| Innervation | Musculocutaneous nerve |
| Name | Extensor indicis |
| Origin | Distal 1/3 ulna |
| Insertion | Extensor expansion of digit 2 |
| Action | Finger extension at MCP and interphalangeal |
| Innervation | Posterior interosseous nerve |
| Name | Opponens pollicis |
| Origin | Trapezium Flexor retinaculum |
| Insertion | 1st metacarpal |
| Action | Opposition of thumb |
| Innervation | Median nerve |