Back forearm

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Back forearm

  1. 1. Faculty Of Medicine Anatomy Department 1
  2. 2. Good morning 2
  3. 3. • deep group of muscles of the back of forearm a) Attachment b) Action c) N. supply • Posterior interosseous nerve. 3
  4. 4. 4 radius ulna Inter-osseous membrane Olecranon coronoid Trochlear notch Styloid process head neck tuberosity Styloid process
  5. 5. 5
  6. 6. 6 12 muscles 1. Supinator 2. Abductor pollicis longus 3. Extensor pollicis brevis 4. Extensor pollicis longus 5. Extensor indices 1. Anconeus 2. Brachioradialis 3. Extensor carpi radialis longus 4. Extensor carpi radialis brevis 5. Extensor digitorum 6. Extensor digiti minimi 7. Extensor carpi ulnaris
  7. 7. 7 Muscles of back of forearm Superficial group (7) Deep group (5) 1 2 3 4 5 6 7 1. Brachioradialis 2. Extensor carpi radialis longus 3. Extensor carpi radialis brevis 4. Extensor digitorum 5. Extensor digiti minimi 6. Extensor carpi ulnaris 7. anconeus
  8. 8. 8 Abductor pollicis longus Extensor pollicis brevis supinator Extensor pollicis longus Extensor indices
  9. 9. 9 - 3 of the deep muscles:- 1. abductor pollicis longus, 2. extensor pollicis brevis, and 3. extensor pollicis longus- - Emerge from between tendons of :  extensor digitorum &  extensor carpi radialis brevis - And pass into the thumb.
  10. 10. 10 All superficial muscles cross the elbow joint (arising from: Tip of lat. Epicondyle) Deep muscles (except supinator)  don’t cross the elbow  Arise from:  2 bones of forearm & interosseous membrane  & pass to: thumb and index While
  11. 11. 11 o Anconeus o Brachioradialis o Extensor carpi radialis longus Radial n. • ECRB • ED • EDM • ECU • Supinator • APL • EPB • EPL • EI Post. Interosseous n.
  12. 12. 12 For any muscle origin insertion action n. supply
  13. 13. 13 Ant. view Post. view Lat. view
  14. 14. supinator 14  
  15. 15. 15 Superficial head 1.lat. Epicondyle 2.Radial collateral lig. 3.Annular lig. trochlea capitulum ulna
  16. 16. 16 Supinator crest & fossa wide shallow depression at the lateral surface of ulna, distal to the tuberosity of ulna. Deep head
  17. 17. 17 lateral surface of the radius (superior to: anterior oblique line & to insertion of pronator teres muscle)
  18. 18. 18 Supinator action: Supinate extended forearm & hand
  19. 19. Supination • Supination (lat. Rotation forearm) 1- Thumb directed lateraly 2- palm faces anteriorly 19
  20. 20. Muscles of supination •In flexed forearm Biceps brachii •In extended forearm supinator 20
  21. 21. Pronation 1-Thumb directed medially 2-Palm faces backwards 3- body of radius lies obliquely across ulna 21 Med. Rotation forearm
  22. 22. 22 supination pronation
  23. 23. 23
  24. 24. 24 1. Abductor pollicis longus
  25. 25. 25 1)Ulna (post. S.) 2)Radius (post. S.) 3)Interosseous membrane. 1st metacarpal bone (lat. Side of base)
  26. 26. 26 1)Abduct & 2)Extend thumb T 1
  27. 27. 27 2. Extensor pollicis brevis
  28. 28. 28 1) Radius (post. S.) 2) Interosseous membrane (post. S.) proximal phalanx thumb (base, post. S.)
  29. 29. 29 Extension proximal phalanx thumb
  30. 30. 30 3. Extensor pollicis longus
  31. 31. 31 1) Ulna (post. S.) 2) Interosseous membrane (post. S.) Distal phalanx thumb (base, post. S.)
  32. 32. 32 Extension distal phalanx thumb
  33. 33. 4. Extensor indices 33
  34. 34. 34 1) Ulna (post. S.) 2) Interosseous membrane (post. S.) Extensor expansion Of index finger
  35. 35. 35 Assit extension all joints of index finger 2
  36. 36. 36 Tendon Extensor indices Tendon of extensor digitorum
  37. 37. 37
  38. 38. 38 radius ulna
  39. 39. 39
  40. 40. 40 Radial nerve (C5,6,7,8 and T1)  largest branch of the brachial plexus.  It is continuation of the posterior cord of the plexus C 5 6 7 8 T1
  41. 41. 41 Leave the axilla by passing in lower Triangular space to back of forearm Run in spiral groove with brofunda brachii a.
  42. 42. 42 Pierce lat. Intermuscular septum To reach ant. Compartment again
  43. 43. 43
  44. 44. 44 Run in groove bet. brachialis & brachioradialis , extensor carpi radialis longus
  45. 45. 45 TERMINATION: divides in front of the lateral epicondyle into superficial & deep terminal branches
  46. 46. 46
  47. 47. 47 descends in the upper 2/3 of forearm under cover of the brachioradialis. In the lower 1/3 of the forearm it passes posteriorly deep to tendon of brachioradialis to reach the dorsum of the hand . Superficial terminal branch of radial n.
  48. 48. 48 Supply skin of the lateral 2/3 of the dorsum of the hand and the dorsal s. of the lateral 3 ½ fingers as far as the second phalanges.
  49. 49. 49 Deep terminal branch Posterior interosseous nerve  One of 2 terminal br. Of radial n.  Infront of lat. Epicondyle humerus
  50. 50. 50 ● winds backwards passing between superficial and deep fibers of the supinator (piercing it) to reach the back of the forearm. ● In the back descends between the superficial and deep m. accompanied by: 1) the post. interosseous a. in the upper part. 2)terminal part of ant. interosseous a. in the lower 1/3 of the forearm
  51. 51. 51
  52. 52. 52
  53. 53. 53 BRANCHES OF THE POSTERIOR INTEROSSEOUS NERVE Before piercing supinator Inside supinator After emerging From supinator 1.Extensor carpi radialis brevis 2.Supinaor supinator 1.Extensor digitorum . 2.Extensor digiti minimi. 3.Extensor carpi ulnaris. 4.Abductor pollicis longus. 5. Extensor pollicis brevis. 6. Extensor pollicis longus. 7. Extensor indicis.
  54. 54. 54 N.B. Post. Interoseous n. supplies all muscles on Lat. side & dorsal S. of the forearm. except  anconeus  brachioradialis &  extensor carpi radialis longus.
  55. 55. 55 The deep terminal branch with anterior interosseous a. Passes deep to extensor retinaculum (in the 4th compartment) to the back of the carpus to supply joints .
  56. 56. 56 radius ulna 4 1
  57. 57. 57 o Anconeus o Brachioradialis o Extensor carpi radialis longus Radial n. • ECRB • ED • EDM • ECU • Supinator • APL • EPB • EPL • EI Post. Interosseous n.
  58. 58. 58 Test the radial nerve
  59. 59. 59
  60. 60. Thank you 60
  61. 61. 61

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