Forearm Extensors
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| 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
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| What muscle(s) make up the lateral group of the superficial layer of forearm extensors? | brachioradialis, ECRL, ECRB
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| What muscle(s) make up the intermediate group of the superficial layer of forearm extensors? | extensor digitorum, extensor digiti minimi
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| What muscle(s) make up the medial group of the superficial layer of forearm extensors? | Extensor carpi ulnaris
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| How many muscles make up the deep layer of the forearm extensors? | 5
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| What muscle(s) make up the deep layer of the forearm extensors? | Supinator, Abductor pollicis longus, Extensor pollicis brevis, Extensor pollicis longus, Extensor indicis,
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| What muscles make up extensor compartment 1? | APL, EPB
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| What muscles make up extensor compartment 2? | ECRL, ECRB
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| What muscles make up extensor compartment 3? | EPL
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| What muscles make up extensor compartment 4? | ED, EI
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| What muscles make up extensor compartment 5? | EDM
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| What muscles make up extensor compartment 6? | ECU
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| Where is the superficial radial nerve palpable? | where it crosses the EPL tendon
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| Superficial radial nerve dives directly beneath ______ and resurfaces __________________________. | brachioradialis, wrist at dorsum of hand
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| What is the power pronator mm? | pronator quadratus
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| what is the primary supinator mm? | Biceps
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| What is the last mm innervated by post interosseus (rad n branches)? | Extensor indicis
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| What are the intrinsic mm’s located on the dorsum of the hand? | There are none.
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| What is the most proximal forearm mm innervated by rad n = ? | brachioradialis
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| what is the primary flexor of elbow? | Brachialis
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| EPL EI are represented as good C8 mm’s, what is the most proximal mm innervated by C8? | Pec minor
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| What artery is found in the snuff box, and supplies blood to the scaphoid bone? | Radial artery
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| What mm runs over the dorsal tubercle of the radius? | EPL
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| What is the most common site for radial nerve lesions? | Near spiral groove of humerus
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| _____= continuation of radial n. distal to the supinator mm. | Posterior interosseous n.
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| 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
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| What arteries supply the posterior compartment of the forearm? | Common, anterior, and posterior interosseous arteries
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| 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
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| Why do the extensor digitorum function as a unit? | Oblique intertendinous connections on dorsum of hand
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| 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.
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| Which artery contributes more to the formation of the dorsal carpal arterial arch? | Radial artery
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Created by:
txst fall 2009
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