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POSTERIOR ANTEBRACHIUM

POSTERIOR ANTEBRACHIUM. Extensor Retinaculum. Deep fascia Transversely crosses distal ends of radius and ulna. Extensor Retinaculum. Converts grooves in radius into tunnels for extensor tendons (lateral to medial): Abductor pollicis longus Extensor pollicis brevis Styloid process

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POSTERIOR ANTEBRACHIUM

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  1. POSTERIOR ANTEBRACHIUM

  2. Extensor Retinaculum • Deep fascia • Transversely crosses distal ends of radius and ulna.

  3. Extensor Retinaculum • Converts grooves in radius into tunnels for extensor tendons (lateral to medial): Abductor pollicis longus Extensor pollicis brevis Styloid process Extensor carpi radialis longus Extensor carpi radialis brevis Dorsal tubercle Extensor pollicis longus Extensor digitorum and extensor indicis

  4. Radial Nerve • Pierces lateral intermuscular septum in lower arm and enters antebrachium between brachioradialis and brachialis muscles. • Passes in front of lateral epicondyle and enters cubital fossa. • Divides into superficial and deep branches.

  5. Radial Nerve Deep Branch • Wraps laterally around radius between superficial and deep layers of supinator. • = posterior interosseous nerve. • Runs with posterior interosseous artery. • Motor to all extensor muscles of the forearm except extensor carpi radialis longus and anconeus.

  6. Radial Nerve Superficial Branch • Cutaneous. • Accompanies radial artery proximally. • Emerges from beneath brachioradialis in distal forearm. • Supplies lateral half of dorsum of hand and dorsum of thumb and index finger.

  7. Radial Artery • Smallest terminal branch of brachial artery. • Proximally lies deep to brachioradialis. • Distally becomes superficial between brachioradialis and flexor carpi radialis. • Winds dorsally through anatomical snuff-box.

  8. Radial Artery Branches • Radial recurrent • Dorsal carpal artery • Dorsal metacarpal and digital arteries • First dorsal metacarpal: Princeps pollicis Radialis indicis

  9. Interosseous Arteries • From common interosseous artery from ulnar artery. • One on either side of interosseous membrane.

  10. Superficial Muscles • Primarily wrist and hand extensors • Common origin = lateral epicondyle: Superior to inferior: Brachioradialis Extensor carpi radialis longus Extensor radialis brevis Extensor digitorum (communis) Extensor digiti minimi Extensor carpi ulnaris

  11. DeepMuscles • Four muscles emerge from antebrachium between extensor carpi radialis muscles and the extensor digitorum muscle. Three outcropping muscles insert on thumb: Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extensor indicis. • Supinator

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