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FRONT OF FOREARM

FRONT OF FOREARM. Dr. Ahmed Fathalla Ibrahim. MUSCLES OF FRONT OF FOREARM. SUPERFICIAL GROUP (5) From lateral to medial: Pronator teres (PT) Flexor carpi radialis (FCR) Palmaris longus (PL) (may be absent) Flexor digitorum superficialis FDS) Flexor carpi ulnaris (FCU) DEEP GROUP (3)

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FRONT OF FOREARM

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  1. FRONT OF FOREARM Dr. Ahmed Fathalla Ibrahim

  2. MUSCLES OF FRONT OF FOREARM • SUPERFICIAL GROUP (5) From lateral to medial: • Pronator teres (PT) • Flexor carpi radialis (FCR) • Palmaris longus (PL) (may be absent) • Flexor digitorum superficialis FDS) • Flexor carpi ulnaris (FCU) • DEEP GROUP (3) • Flexor pollicis longus (FPL) • Flexor digitorum profundus (FDP • Pronator quadratus (PQ)

  3. SUPERFICIAL GROUP • ORIGINS: • All 5 muscles have a HUMERAL HEAD (arising from the front of medial epicondyle of humerus: (common flexor origin). IN ADDITION: • 3 out of 5 muscles have an ULNAR HEAD: • PT & FDS: arise from medial border of coronoid process of ulna • FCU: arises from medial surface of olecranon process & posterior border of shaft of ulna • One muscle has a RADIAL HEAD: • FDS: arises from oblique line & anterior border of shaft of radius

  4. SUPERFICIAL GROUP • ACTIONS & INSERTIONS: • One pronator of radioulnar joints (PT): produces powerful pronation • Any muscle acting on radioulnar joint must be inserted into radius • Insertion: middle of lateral surface of shaft of radius (point of maximum curvature)

  5. SUPERFICIAL GROUP • ACTIONS & INSERTIONS: • 3 flexors of wrist joint (FCR, FCU, PL) • Any “carpi” is inserted into metacarpal bone • FCR (flexion + abduction of wrist joint): inserted into 2nd & 3rd metacarpal bones • FCU (flexion + adduction of wrist joint): insertedinto 5th metacarpal bone (+ pisiform & hamate) • PL (flexion of wrist joint): inserted into palmar aponeurosis

  6. SUPERFICIAL GROUP • ACTIONS & INSERTIONS: • One flexor of medial 4 fingers (FDS): produces flexion of proximal interphalangeal & metacarpophalangeal joints of medial 4 fingers • Insertion:by 4 tendons into the middle phalanges of medial 4 fingers

  7. SUPERFICIAL GROUP

  8. SUPERFICIAL GROUP

  9. DEEP GROUP • ALL MUSCLES ARE ATTACHED TO ANTERIOR SURFACE OF SHAFT OF RADIUS AND/OR ULNA

  10. DEEP GROUP

  11. Flexor pollicis longus • ORIGIN: Middle of anterior surface of shaft of radius(+ interosseous membrane) • INSERTION: distal phalanx of thumb • ACTION: flexion of interphalangeal & metacarpophalangeal joints of thumb

  12. FLEXOR DIGITORUM PROFUNDUS • ORIGIN: Upper ¾ of anterior surface of shaft of ulna(+ interosseous membrane) • INSERTION: by 4 tendons into thedistal phalanges of medial 4 fingers • ACTION: flexion of distal & proximal interphalangeal + metacarpophalangeal joints of medial 4 fingers

  13. PRONATOR QUADRATUS • ORIGIN: Lower ¼ of anterior surface of shaft of ulna • INSERTION: Lower ¼ of anterior surface of shaft of radius • ACTION: main pronator of radioulnar joints

  14. DEEP GROUP

  15. DEEP GROUP

  16. NERVE SUPPLY • ALL MUSCLES OF FRONT OF FOREARM ARE SUPPLIED BY MEDIAN NERVE EXCEPT: • FCU ULNAR • MEDIAL HALF OF FDP NERVE

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