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UEX extensor Muscles

Rhodri Griffiths

QuestionAnswer
Extensor Muscles of the of the Forearm (11) Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Supinator Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extenso
Origin of Brachioradialis 1. upper lateral supracondylar ridge of humerus (between the triceps and brachialis muscles) 2. lateral intermuscular septum of humerus
Insertion of Brachioradialis 1. superior aspect of styloid process of radius 2. lateral side of the distal 1/2 to 1/3 of the radius 3. antebrachial fascia
Action of Brachioradialis 1. flexes the forearm at the elbow 2. pronates the forearm when supinated 3. supinates the forearm when pronated
Blood of Brachioradialis radial recurrent artery
Nerve of Brachioradialis Radial nerve C5 C6 C7
Origin of Extensor carpi radialis longus 1. lower lateral supracondylar ridge (below the brachioradialis) 2. lateral intermuscular septum of humerus
Insertion of Extensor carpi radialis longus base of 2nd metacarpal
Action of Extensor carpi radialis longus 1. Extends the hand at the wrist 2. Radially deviates the hand at the wrist 3. Weakly flexes the forearm at the elbow 4. Weakly supinates the forearm
Blood of Extensor carpi radialis longus radial recurrent artery
Nerve of Extensor carpi radialis longus Radial nerve C7 C8
Origin of Extensor carpi radialis brevis 1. Lateral epicondyle via the CET (common extensor tendon) 2. Radial collateral ligament 3. Antebrachial fascia
Insertion of Extensor carpi radialis brevis Base of 3rd metacarpal
Action of Extensor carpi radialis brevis 1. Extends the hand at the wrist 2. Radially deviates the hand at the wrist
Blood of Extensor carpi radialis brevis Radial recurrent artery
Nerve of Extensor carpi radialis brevis Radial nerve C7 C8
Origin of Extensor digitorum 1. Lateral epicondyle via the CET (common extensor tendon) 2. Antebrachial fascia
Insertion of Extensor digitorum 1. Base of middle phalanx of each of the four fingers (central band) 2. Base of distal phalanx of each of the four fingers (2 lateral bands)
Action of Extensor digitorum 1. Extends the four medial digits 2. Extends the wrist if fingers flexed 3. Abducts the digits (spreads the digits as it extends them)
Blood of Extensor digitorum posterior interosseous artery
Nerve of Extensor digitorum Radial nerve C7 C8
Origin of Extensor digiti minimi 1. lateral epicondyl via the CET (common extensor tendon) 2. antebrachial fascia 3. ulnar aspect of extensor digitorum
Insertion of Extensor digiti minimi 1. base of middle phalanx of the 5th digit (central band) 2. base of distal phalanx of the 5th digit (2 lateral bands)
Action of Extensor digiti minimi 1. extends the 5th digit 2. abducts the 5th digit
Blood of Extensor digiti minimi posterior interosseous artery
Nerve of Extensor digiti minimi Radial nerve C7 C8
Origin of Extensor carpi ulnaris 1. 1st head - lateral epicondyle via the CET (common extensor tendon) 2. 2nd head - posterior body of ulna 3. Antebrachial fascia
Insertion of Extensor carpi ulnaris Medial side of base of the 5th metacarpal
Action of Extensor carpi ulnaris 1. extends the hand at the wrist 2. ulnarly deviates the hand at the wrist
Blood of Extensor carpi ulnaris Posterior interosseous artery
Nerve of Extensor carpi ulnaris Radial nerve C7 C8
Origin of Supinator 1. lateral epicondyle of humerus 2. supinator crest of ulna 3. radial collateral ligament 4. annular ligament 5. antebrachial fascia
Insertion of Supinator proximal portion of anteriorlateral surface of the radius
Action of Supinator supinates the forearm
Blood of Supinator radial recurrent artery
Nerve of Supinator Radial nerve C7 C8
Origin of Abductor pollicis longus 1. posterior surfaces of ulna and radius 2. interosseous membrane 3. antebrachial fascia
Insertion of Abductor pollicis longus lateral aspect of base of 1st metacarpal
Action of Abductor pollicis longus 1. abducts the 1st metacarpal 2. assists to extend & rotate the thumb 3. radially deviates the hand at the wrist 4. flexes the hand at the wrist
Blood of Abductor pollicis longus Posterior interosseous artery
Nerve of Abductor pollicis longus Radial nerve C7 C8
Origin of Extensor pollicis brevis 1. Posterior surfaces of radius (below abductor pollicis longus) 2. Interosseous membrane 3. Antebrachial fascia
Insertion of Extensor pollicis brevis Base of proximal phalanx of thumb (often a slip inserts into extensor pollicis longus tendon)
Action of Extensor pollicis brevis 1. Extends the proximal phalanx and 1st metacarpal of the thumb 2. Radially deviates the hand at the wrist
Blood of Extensor pollicis brevis posterior interosseous artery
Nerve of Extensor pollicis brevis Radial nerve C7 C8
Origin of Extensor pollicis longus 1. posterior surface of ulna 2. interosseous membrane 3. antebrachial fascia
Insertion of Extensor pollicis longus Distal phalanx of thumb
Action of Extensor pollicis longus 1. Extends distal phalanx of thumb 2. Extends proximal phalanx of thumb 3. Assists to extend the hand at the wrist (if fingers flexed)
Blood of Extensor pollicis longus Posterior interosseous artery
Nerve of Extensor pollicis longus Radial nerve C7 C8
Origin of Extensor indicis 1. Posterior surface of ulna (distal to extensor pollicis longus) 2. Interosseous membrane 3. Antebrachial fascia
Insertion of Extensor indicis base of middle and distal phalanx of the index finger
Action of Extensor indicis 1. extends the 2nd digit (McP & IP joints) 2. adducts the 2nd digit 3. assists to extend the hand at the wrist 4. stabilizes McP joint for flexion of IP solely
Blood of Extensor indicis posterior interosseous artery
Nerve of Extensor indicis Radial nerve C7 C8
Created by: Rhodri
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