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Anatomy UE
Forearm Extensors
| Question | Answer |
|---|---|
| What are the three groups of the superficial layer of the forearm extensors and how many muscles are there? | lateral, intermediate, and medial/6 muscles |
| What muscle(s) make up the lateral group of the superficial layer of forearm extensors? | brachioradialis, ECRL, ECRB |
| What muscle(s) make up the intermediate group of the superficial layer of forearm extensors? | extensor digitorum, extensor digiti minimi |
| What muscle(s) make up the medial group of the superficial layer of forearm extensors? | Extensor carpi ulnaris |
| How many muscles make up the deep layer of the forearm extensors? | 5 |
| What muscle(s) make up the deep layer of the forearm extensors? | Supinator, Abductor pollicis longus, Extensor pollicis brevis, Extensor pollicis longus, Extensor indicis, |
| What muscles make up extensor compartment 1? | APL, EPB |
| What muscles make up extensor compartment 2? | ECRL, ECRB |
| What muscles make up extensor compartment 3? | EPL |
| What muscles make up extensor compartment 4? | ED, EI |
| What muscles make up extensor compartment 5? | EDM |
| What muscles make up extensor compartment 6? | ECU |
| Where is the superficial radial nerve palpable? | where it crosses the EPL tendon |
| Superficial radial nerve dives directly beneath ______ and resurfaces __________________________. | brachioradialis, wrist at dorsum of hand |
| What is the power pronator mm? | pronator quadratus |
| what is the primary supinator mm? | Biceps |
| What is the last mm innervated by post interosseus (rad n branches)? | Extensor indicis |
| What are the intrinsic mm’s located on the dorsum of the hand? | There are none. |
| What is the most proximal forearm mm innervated by rad n = ? | brachioradialis |
| what is the primary flexor of elbow? | Brachialis |
| EPL EI are represented as good C8 mm’s, what is the most proximal mm innervated by C8? | Pec minor |
| What artery is found in the snuff box, and supplies blood to the scaphoid bone? | Radial artery |
| What mm runs over the dorsal tubercle of the radius? | EPL |
| What is the most common site for radial nerve lesions? | Near spiral groove of humerus |
| _____= continuation of radial n. distal to the supinator mm. | Posterior interosseous n. |
| What are the three branches of the ulnar artery (located in and around IM)? | common interosseous artery which then splits into the anterior interosseous artery Posterior interosseous artery |
| What arteries supply the posterior compartment of the forearm? | Common, anterior, and posterior interosseous arteries |
| Are there any nerves or arteries that are contained within the extensor compartments? | None that are named, there is some form of blood supply and innervation |
| Why do the extensor digitorum function as a unit? | Oblique intertendinous connections on dorsum of hand |
| What do the ulnar and radial arteries join to form (dorsally)? What does this then branch into? | They form the dorsal carpal arterial arch which branches into the 5 dorsal metacarpal arteries. |
| Which artery contributes more to the formation of the dorsal carpal arterial arch? | Radial artery |
Created by:
txst fall 2009
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