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Exam 6 A&P
Origin-Insertion-Action-Innervation of forarm extensors
| Question | Answer |
|---|---|
| Origin of Supinator | Lateral epicondyle of the humerus, crest of the ulna, supinator fossa, radial collateral and anular ligaments |
| Insertion of Supinator | Surface of the proximal third of the radial shaft |
| Action of Supinator | Forearm supination |
| Innervation of Supinator | Deep branch of the radial nerve |
| Origin of Extensor digitorum | Lateral epicondyle of the humerus |
| Insertion of Extensor digitorum | Posterior surfaces of the middle and distal phalanges (2nd-5th) |
| Innervation of Extensor digitorum | Posterior interosseus nerve (branch of the radial nerve) |
| Action of Extensor digitorum | Extension of the index, middle, ring and little fingers |
| Origin of Extensor carpi ulnaris | Lateral epicondyle of the humerus, posterior border of the ulna |
| Insertion of Extensor carpi ulnaris | Medial side of the base of the metacarpal V |
| Action of Extensor carpi ulnaris | Extension and adduction of the wrist |
| Innervation of Extensor carpi ulnaris | Posterior interosseus nerve (branch of the radial nerve) |
| Origin of Extensor carpi radialis longus | Lateral supra-epicondylar bridge of humerus |
| Insertion of Extensor carpi radialis longus | Base of the 2nd metacarpal |
| Action of Extensor carpi radialis longus | Extension and abduction of the hand at the wrist joint |
| Innervation of Extensor carpi radialis longus | Radial nerve |
| Origin of Extensor carpi radialis brevis | Lateral epicondyle of humerus |
| Insertion of Extensor carpi radialis brevis | Base of the 3rd metacarpal |
| Action of Extensor carpi radialis brevis | Extension and abduction of the hand at the wrist joint |
| Innervation of Extensor carpi radialis brevis | Deep branch of radial nerve |
| Origin of Extensor indicis proprius | Posterior side of the distal third of the ulnar shaft; interosseous membrane |
| Insertion of Extensor indicis proprius | External expansion of the 2nd digit |
| Action of Extensor indicis proprius | Extension of the 2nd digit |
| Innervation of Extensor indicis proprius | Posterior interosseous nerve |
| Origin of Extensor digiti minimi | Lateral epicondyle of the humerus |
| Insertion of Extensor digiti minimi | Dorsal aponeurosis of the little finger |
| Action of Extensor digiti minimi | Extension of the little finger |
| Innervation of Extensor digiti minimi | Posterior interosseus nerve (branch of the radial nerve) |
| Origin of Brachioradialis | Proximal two-thirds of the supra-epicondylar ridge of the humerus |
| Insertion of Brachioradialis | Lateral surface of the distal end of the radius |
| Action of Brachioradialis | Forearm flexion, especially during mid-pronation |
| Innervation of Brachioradialis | Radial nerve |
| mnemonic that summarizes the brachioradialis: follows the BR rule Function | Its the Beer mug Raising muscle (i.e. flexes elbow, strongest when the wrist is held for holding a beer mug.) |
| mnemonic that summarizes the brachioradialis: follows the BR rule Innervation | Breaks Rule in that it's a flexor muscle, But Radial. (Radial nerve usually is for extensors). One relation: Behind it is the Radial nerve in the cubital fossa. |
Created by:
JML19
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