Muscles of the forearm

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Muscles of the forearm

  1. 1. The forearm Prepared By : Dr. Mohaned Abu lehea
  2. 2. Contents of the Anterior Fascial Compartment of the Forearm • Muscles: • A superficial group : consisting of the pronator teres, the flexor carpi radialis, the palmaris longus, and the flexor carpi ulnaris. • An intermediate group : consisting of the flexor digitorum superficialis; and a • Deep group : consisting of the flexor pollicis longus, the flexor digitorum profundus, and the pronator quadratus
  3. 3. • Blood supply to the muscles: Ulnar and radial arteries • Nerve supply to the muscles: • All the muscles are supplied by the median nerve and its branches, except the flexor carpi ulnaris and the medial part of the flexor digitorum profundus, which are supplied by the ulnar nerve
  4. 4. Muscles of the Anterior Fascial Compartment of the Forearm
  5. 5. Pronator Teres
  6. 6. Pronator Teres • Origin • Humeral head : Medial epicondyle of humerus • Ulnar head : Medial border of coronoid process of ulna • Action • Lateral aspect of shaft of radius
  7. 7. • Nerve supply : Median nerve • Action : Pronation and flexion of forearm
  8. 8. Flexor carpi radialis
  9. 9. Flexor carpi radialis • Origin • Medial epicondyle of humerus • Insertion • Bases of second and third metacarpal bones
  10. 10. • Nerve supply • Median nerve • Action • Flexes and abducts hand at wrist joint
  11. 11. Flexor Carpi Ulnaris
  12. 12. Flexor Carpi Ulnaris • Origin • Humeral head : Medial epicondyle of humerus • Ulnar head : Medial aspect of olecranon process and posterior border of ulna • Insertion • Pisiform bone, hook of the hamate, base at fifth metacarpal bone
  13. 13. • Nerve supply • Ulnar nerve • Action • Flexes and adducts hand at wrist joint
  14. 14. Palmaris longus
  15. 15. s
  16. 16. Palmaris longus • Origin • Medial epicondyle of humerus • Insertion • Flexor retinaculum and palmar aponeurosis
  17. 17. • Nerve supply • Median nerve • Action • Flexes hand
  18. 18. Flexor Digitorum Superficialis
  19. 19. Flexor Digitorum Superficialis • Origin • Humeroulnar head : Medial epicondyle of humerus; medial border of coronoid process of ulna • Radial head : Oblique line on anterior surface of shaft of radius • Insertion • Middle phalanx of medial four fingers
  20. 20. • Nerve supply • Median nerve • Action • Flexes middle phalanx of fingers and assists in flexing proximal phalanx and hand
  21. 21. Flexor pollicis longus
  22. 22. Flexor pollicis longus • Origin • Anterior surface of shaft of radius • Insertion • Distal phalanx of thumb
  23. 23. • Action • Flexes distal phalanx of thumb • Nerve supply • Anterior interosseous branch of median nerve
  24. 24. Flexor digitorum profundus
  25. 25. Flexor digitorum profundus • Origen • Anteromedial surface of shaft of ulna • Insertion • Distal phalanges of medial four fingers
  26. 26. • Action • Flexes distal phalanx of fingers; then assists in flexion of middle and proximal phalanges and wrist • Nerve supply • Ulnar (medial half) and median (lateral half) nerves
  27. 27. Pronator quadratus
  28. 28. Pronator quadratus • Origin • Anterior surface of shaft of ulna • Insertion • Anterior surface of shaft of radius
  29. 29. • Action • Pronates forearm • Nerve Supply • Anterior interosseous branch of median nerve
  30. 30. Muscles of the Lateral Fascial Compartment of the Forearm
  31. 31. Brachioradialis
  32. 32. Brachioradialis • Origin • Lateral supracondylar ridge of humerus • Insertion • Base of styloid process of radius
  33. 33. • Action • Flexes forearm atridge of humerus elbow joint rotates forearm to the midprone position • Nerve supply • Radial nerve
  34. 34. Extensor carpi radialis longus
  35. 35. Extensor carpi radialis longus • Origin • Lateral supracondylar ridge of humerus • Insertion • Posterior surface of base of second metacarpal bone
  36. 36. • Action • Extends and abducts hand at wrist joint • Nerve supply • Radial nerve
  37. 37. Muscles of the Posterior Fascial Compartment of the Forearm
  38. 38. Extensor carpi radialis brevis
  39. 39. Extensor carpi radialis brevis • Origin • Lateral epicondyle of humerus • Insertion • Posterior surface of base of third metacarpal bone
  40. 40. • Action • Extends and abducts hand at wrist joint • Nerve supply • Deep branch of radial nerve
  41. 41. Extensor digitorum
  42. 42. Extensor digitorum • Origin • Lateral epicondyle of humerus • Insertion • Middle and distal phalanges of medial four fingers
  43. 43. • Action • Extends fingers and hand • Nerve supply • Deep branch of radial nerve
  44. 44. Extensor digiti minimi
  45. 45. Extensor digiti minimi • Origin • Lateral epicondyle of humerus • Insertion • Extensor expansion of little finger
  46. 46. • Action • Extends metacarpal phalangeal joint of little finger • Nerve supply • Deep branch of radial nerve
  47. 47. Extensor carpi ulnaris
  48. 48. Extensor carpi ulnaris • Origin • Lateral epicondyle of humerus • Insertion • Base of fifth metacarpal bone
  49. 49. • Action • Extends and adducts hand at wrist joint • Nerve supply • Deep branch of radial nerve
  50. 50. Anconeus
  51. 51. Anconeus • Origin • Lateral epicondyle of humerus • Insertion • Lateral surface of olecranon process of ulna
  52. 52. • Action • Extends elbow joint • Nerve supply • Radial nerve
  53. 53. Supinator
  54. 54. Supinator • Origin • Lateral epicondyle of humerus, anular ligament of proximal radioulnar joint, and ulna • Insertion • Neck and shaft of radius
  55. 55. • Action • Supination of forearm • Nerve supply • Deep branch of radial nerve
  56. 56. Abductor pollicis longus
  57. 57. Abductor pollicis longus • Origin • Posterior surface of shafts of radius and ulna • Insertion • Base of first metacarpal bone
  58. 58. • Action • Abducts and extends thumb • Nerve supply • Deep branch of radial nerve
  59. 59. Extensor pollicis brevis
  60. 60. Extensor pollicis brevis • Origin • Posterior surface of shaft of radius • Insertion • Base of proximal phalanx of thumb
  61. 61. • Action • Extends metacarpophalangeal joints of thumb • Nerve supply • Deep branch of radial nerve
  62. 62. Extensor pollicis longus
  63. 63. Extensor pollicis longus • Origin • Posterior surface of shaft of ulna • Insertion • Base of distal phalanx of thumb
  64. 64. • Action • Extends distal phalanx of thumb • Nerve supply • Deep branch of radial nerve
  65. 65. Extensor indicis
  66. 66. Extensor indicis • Origin • Posterior surface of shaft of ulna • Insertion • Extensor expansion of index finger
  67. 67. • Action • Extends metacarpophalangeal joint of index finger • Nerve Supply • Deep branch of radial nerve
  68. 68. Thanks

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