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Anatomy UE

Forearm Extensors

QuestionAnswer
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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