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Post. Forearm
Gross Anatomy of the Posterior Forearm
| Question | Answer |
|---|---|
| Brachioradialis Prox. | Lateral supracondylar ridge of humerus |
| Brachioradialis Dist. | Base of styloid process of radius |
| Brachioradialis Act. | Elbow Flexion |
| Brachioradialis Inn. | Radial Nerve |
| Supinator Prox. | Lateral epicondyle of humerus |
| Supinator Dist. | Lateral surface of upper 1/3 of radius |
| Supinator Act. | Acts alone in slow supination |
| Supinator Inn. | Radial Nerve |
| ECR Longus Prox. | Lower 1/3 of lateral humerus |
| ECR Longus Dist. | Base of 2nd metacarpal |
| ECR Longus Act. | Wrist extension and ABduction |
| ECR Longus Inn. | Radial Nerve |
| ECR Brevis Prox. | Lateral epicondyle of humerus |
| ECR Brevis Dist. | Base of 3rd metacarpal |
| ECR Brevis Act. | Wrist flexion and ABduction |
| ECR Brevis Inn. | Radial Nerve |
| ECU Prox. | Lateral epicondyle of humerus |
| ECU Dist. | Base of 5th metacarpal |
| ECU Act. | Wrist extension and ADduction |
| ECU Inn. | Deep Radial Nerve |
| Extensor Digitorum Prox. | Lateral epicondyle of humerus |
| Extensor Digitorum Dist. | Middle part attaches to middle phalanx base and 2 Lateral parts split and attach to distal phalanx |
| Extensor Digitorum Act. | Extends 4 fingers at DIP joint |
| Extensor Digitorum Inn. | Deep Radial Nerve |
| Adductor Pollicis Longus Prox. | Proximal dorsal surface of radius and ulna |
| Adductor Pollicis Longus Dist. | Radial side of 1st metacarpal |
| Adductor Pollicis Longus Act. | ABducts thumb |
| Adductor Pollicis Longus Inn. | Deep Radial Nerve |
| Extensor Pollicis Brevis Prox. | Distal radius |
| Extensor Pollicis Brevis Dist. | Posterior proximal phalanx of thumb |
| Extensor Pollicis Brevis Act. | Extends proximal phalanx of thumb |
| Ext. Digiti Minimi Prox. | Common tendon of ext. digitorum |
| Ext. Digiti Minimi Dist. | Ext. Digitorum tendon at proximal pinky |
| Ext. Digiti Minimi Act. | Extends proximal phalanx of pinky |
| Ext. Digiti Minimi Inn. | Deep Radial Nerve |
| Extensor Indicis Prox. | Dorsal surface of lower 1/2 of ulna |
| Extensor Indicis Dist. | Ulnar side of ext. digitorum |
| Ext. Indicis Act. | Extends and assists w/ ADduction of proximal phalanx of index finger |
| Ext. Indicis Inn. | Deep Radial Nerve |
| Ext. Pollicis Longus Prox. | Posterior Ulna |
| Ext. Pollicis Longus Dist. | Posterior base of distal phalanx |
| Ext. Pollicis Longus Act. | Extends distal phalanx of thumb |
| Ext. Pollicis Longus Inn. | Deep Radial Nerve |
| Lateral Border of Anatomical Snuffbox | ABductor Pollicis Longus and Extensor Pollicis Brevis |
| Medial Border of Anatomical Snuffbox | Ext. Pollicis Longus |
| Floor of Anatomical Snuffbox | Scaphoid Bone |
| Roof of Anatomical Snuffbox | Skin and Fascia |
Created by:
frankfrank05
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