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Muscles By: alex fiori. Abductor pollicis longus Origin: – posterior surfaces of ulna and radius – interosseous membrane – antebrachial fascia Insertion:

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Presentation on theme: "Muscles By: alex fiori. Abductor pollicis longus Origin: – posterior surfaces of ulna and radius – interosseous membrane – antebrachial fascia Insertion:"— Presentation transcript:

1 Muscles By: alex fiori

2 Abductor pollicis longus Origin: – posterior surfaces of ulna and radius – interosseous membrane – antebrachial fascia Insertion: lateral aspect of base of 1st metacarpal Action: – abducts the 1st metacarpal – assists to extend & rotate the thumb – radially deviates the hand at the wrist – flexes the hand at the wrist Blood: posterior interosseous artery Nerve: posterior interosseous nerve of the radial nerve, C6,7,(C8)

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4  Abductor Pollicis Longus

5 Extensor carpi ulnaris Origin: – 1st head - lateral epicondyle via the CET (common extensor tendon) – 2nd head - posterior body of ulna – antebrachial fascia Insertion: medial side of base of the 5th metacarpal Action: – extends the hand at the wrist – ulnarly deviates the hand at the wrist Blood: posterior interosseous artery Nerve: posterior interosseous nerve of the radial nerve, C6,7,8

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7 Extensor Carpi Ulnaris

8 Extensor pollicis brevis Origin: – posterior surfaces of radius (below abductor pollicis longus) – interosseous membrane – antebrachial fascia Insertion: base of proximal phalanx of thumb (often a slip inserts into extensor pollicis longus tendon) Action: – extends the proximal phalanx and 1st metacarpal of the thumb – radially deviates the hand at the wrist Blood: posterior interosseous artery Nerve: posterior interosseous nerve of the radial nerve, C6,7,(C8)

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10 Extensor Pollicis Brevis

11 Extensor pollicis longus Origin: – posterior surface of ulna – interosseous membrane – antebrachial fascia Insertion: distal phalanx of thumb Action: – extends distal phalanx of thumb – extends proximal phalanx of thumb – assists to extend the hand at the wrist (if fingers flexed) Blood: posterior interosseous artery Nerve: posterior interosseous nerve of the radial nerve, C6,7,8

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14 supinator Origin: – lateral epicondyle of humerus – supinator crest of ulna – radial collateral ligament – annular ligament – antebrachial fascia Insertion: proximal portion of anteriorlateral surface of the radius Action: supinates the forearm Blood: radial recurrent artery Nerve: deep branch of the radial nerve, C6

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