Extensors of the Dorsum of the forearm

  1. mneumonic to remember the superficial, intermediate and deep muscles of the dorsum of the forearm
    • Superficial layer:
    • “Big Chocolate Chips, Double Dip Cherries”
    • *** For words that start with the same letter, the longer word = the longer muscle!

    • Brachioradialis
    • !!- This muscle is unique in that it is in the posterior compartment and is therefore innervated by the radial nerve, but unlike the other posterior forearm muscles, it flexes the arm, instead of extending!

    • extensor Carpi radialis longus (ECRL)
    • extensor Carpi radialis brevis (ECRB)
    • extensor Digitorum (ED)
    • extensor Digiti minimi (EDM)
    • extensor Carpi ulnaris (ECU)
    • (sometimes this layer is split into superficial and intermediate layers, with ED and EDM making up the intermediate layer, but in my experience on tests and on the wards, just remembering the superficial and deep layers is perfectly fine!).

    • Deep layer:
    • “Syrup And Peanuts Preferably Included”

    • Supinator
    • Abductor pollicis longus (APL)
    • extensor Pollicis brevis (EPB)
    • extensor Pollicis longus (EPL)
    • extensor Indicis
  2. Which muscles of the posterior compartment are innevrated by the radial nerve ?
    • The brachioradialis, the anconeus, and the extensor carpi radialis longus.
    • muscles that are higher up
  3. Which muscles of the posterior arm are innevrated by the deep branch of the radial nerve
    • extensor carpi radialis brevis
    • supinator ( which it pierces )
  4. How to remember the innervations of the posterior foreamr muscles.
    • All the other muscles that are not innervated by the deep branch of the radial nerve or the radial nerve are innervated by the posterior interosseous nerve
    • any muscles that go to the finger are innervated by the posterior interosseous nerve
  5. there is a posterior interoseous artery, what is significant about it ?
    • It runs with the posterior interosseous nerve 
    • comes from the common interosseous  branch of the ulnar artery.
  6. Anatomical snuffbox
    • made up of the extensor policis brevis and the extensor pollicis longus tendon
    • this where you find the radial artery and under the radial artery is the scaphoid bone
  7. Palmar brevis attachements
    medial aspect of the palmar aponeurosis  and skin over the hypothenar evidence
  8. palmar brevis action
    wrinkles skin of medial palm ( pinky/ulnar side)
  9. Palmar brevis innervation
    ulnar nerve
  10. Abductor policis brevis attachments
    • transverse carpal ligament and tubercle of scaphoid and trapezium
    • base of phalanx of the thumb digit 5
  11. Abductor policis brevis of action
    abductor the thumb (digit 5)
  12. abductor policis brevis innervation
    recurrent branch of the median nerve
  13. Flexor policis brevis attachment
    • transverse carpal ligament and tubercle of scaphoid and trapezium
    • volar side of the base of phalanx of the thumb digit 5
  14. Flexir policis brevis action
    flexes the thumb (digit 5)
  15. Flexor policis brevis innervation
    recurrent branch of the median nerve
  16. Opponens policis
    • transverse carpal ligament and tubercle of scaphoid and trapezium
    • lateral side of the shaft of the first metacarpal bone( thumb digit 5)
  17. opponens policis action
    Rotates the first metacarpal toward the palm
  18. opponens policis innervation
    recurrent branch of the median nerve
  19. Muscles innervated by the Recurrent branch of the median nerve and attached to the transverse carpal ligament and tubercle of the scaphoid & trapezium
    • Abductor policis brevis
    • flexor policis brevis 
    • opponens policis
  20. muscles innervated by the deep branch of the ulnar nerve
    • abductor digit minimi
    • Flexor digit minimi brevis 
    • opponens digiti minimi
  21. Muscles of the deep palm
    • 4 main muscles/ muscles groups
    • Lumbricals 
    • ADDuctor pollicis( 2 heads)
    • Palmar interossei 
    • Dorsal interossei
  22. Lumbrical attachements
    flexor digitorum profundus tendons and radial side ( aka later side starting with digit 2) of the extensor expansion of digits 2-5
  23. lumbrical actions
    Flexes the metacarpophalangeal joint and extends the proximal interphalageal joint of digits 2-5
  24. What is the innervation for the lumbrical 1 and 2 ?
    The median nerve
  25. what are the innervations of lumbricals 3 and 4?
    The deep branch of the ulnar nerve
  26. ADDuctor policis attachements
    • The transverse head is attached to the shaft of the third metacarpal 
    • The oblique head is attached to the second and third metacarpal and adjacent carpal bones 
    • And, the medial side of the proximal phalanx of the digit 1( aka the thumb)
  27. Adductor policis actions
    • ADDucts digit 1
    • adducts the thumb
    • draws the thumb toward the plane of the hand
  28. Adductor policis innervation
    The depe branch of the ulnar nerve
  29. Palmar interossei attachements
    • palm side of metacarpal of digits 2,4, and 5
    • base of proximal phalanges ad extensor expansion of digit 2,4 and 5
  30. Palmar interossei actions
    Adducts digits 2,4, and 5 and assissts lumbricals in MCP flexion and DIP PIP extension of digit 2-5 

    DOES NOT MOVE THE THUMB !
  31. innervation of the palmar interossei
    The deep branch of the ulnar nerve
  32. Dorsal interossei attachments
    • the metacarpals of 1-5 ( this includes the thumb all the way to the pinky)
    • And, the base od the proximal phalanges and the extensor expansion of digits 2-4
  33. Dorsal interossei innervation
    deep branch of the ulnar nerve
  34. Dorsal interossei actions
    abduct digits 2-4 and assist lumbrical in MCP flexion and PIP DIP extension of digits 2-5
  35. What hand muscles are innervated by the deep branch of the ulnar nerve
    • Palmar interossei
    • Dorsal interossei
    • adductor pollicis 
    • lumbrical 3 and 4 
    • Hypothenar muscles
  36. What hand muscles are innervated by the recurrent branch of the median nerve?
    The Thenar muscles:

    • Abductor policis brevis 
    • Flexor policis brevis 
    • Opponens policis
  37. Pronator Teres attachement?
    • medial edpicondyle suprecondylar ridge medial side of the coronoid process 
    • lateral midshaft of the radius
  38. Pronator Teres innervation
    median Nerve
  39. Pronator Teres action
    Pronates and flexes the forearm
  40. Flexor Carpi radialis attachments
    • Medial epicondyle of humerus
    • and Base of metacarpals 2–3
  41. Flexor Carpi radialis actions
    Flexes and abducts the wrist
  42. Flexor Carpi radialis innervation
    median nerve
  43. Palmar longus attachments
    • Medial epicondyle of humerus
    • Palmar aponeurosis
  44. Palmar aponeurosis actions
    flexes the wrist
  45. Palmar aponeurosis innervation
    median nerve
  46. Flexor Carpi ulnaris innervation
    ulnar nerve
  47. Flexor Carpi ulnaris attachments
    • Medial epicondyle of humerus and 
    • Pisiform bone and base of metacarpal 5
  48. Flexor Carpi ulnaris actions
    Flexes and adducts the wrist
  49. Muscles innervated by the median nerve
    • Flexor carpi radialis
    • Palmar Longus
    • Pronator Teres 
    • ( above are superficial)
    • Flexor Digitorum superficialis ( intermediate)
  50. Flexor Digitorum superficialis ( intermediate) attachments
    • Medial epicondyle of humerus and oblique line of radius
    • and Middle phalanges of digits 2–5
  51. Flexor digitorum superficialis actions
    Flexes PIP of digits 2–5
  52. Flexor digitorum superficialis innervation
    Median nerve
  53. Flexor digitorum profundus actions
    Flexes DIP of digits 2–5
  54. Flexor digitorum profundus attachments
    • Anterior and medial surface of ulna and interosseous membrane
    • and Distal phalanges of digits 2–5
  55. Flexor digitorum profundus innervation
    • lateral half: anterior interosseous n. 
    • medial half: ulnar nerve
  56. Flexor Pollicis longus action
    Flex interphalangeal joint of digit 1 the thumb
  57. Flexor pollicis longus attachments
    • Anterior surface of radius and interosseous membrane
    • and base of the distal phalanx of the thumb
  58. Flexor pollicis longus innervation
    anterior interosseous branch of the median nerve
  59. Pronator quadratus innervation
    anterior interosseous branch of the median nerve
  60. Pronator quadratus attachments
    Distal radiu and Distal ulna
  61. Pronator quadtratus action
    pronates the forearm
  62. What are the deep muscles of the anterior compartment of the forearm ?
    • Flexor digitorum profundus 
    • Flexor pollicis longus 
    • and pronator quadratus 
    • There are 3
  63. What are the superficial muscles of the anterior forearm ?
    and the intermediate muscle(s)?
    • Pass Fail, Pass Fail 
    • Pronator teres
    • flexor carpi radialis
    • palmar longus 
    • flexor carpi unlaris
    • Named from lateral to medial 
    • Know how to locate on both hands
    • intermediate: flexor digitorum superficialis
  64. What are the superficial muscles of the posterior compartment of the forearm ?
    • Ancones
    • brachioradialis
    • Extensor carpi radialis longus
    • extensor carpi radialis brevis
    • extensor digitorum 
    • extensor digit mini
    • extensor carpi ulnaris 
    • Mneumonic :

     A Big Chocolate Chip Double Dipped Cock (Cherry)
  65. What are the Deep muscles of the posterior compartment of the forearm
    • Mnemonic: 
    • Syrup And Peanuts preferable included 
    • Supinator 
    • Abductos policis longus 
    • Extensor policis brevis
    • Extensor policis longus
    • Estensor Indicis
  66. Aconeus attachements
    Lateral epicondyle of humerus and 

    Lateral surface of olecranon and posterior surface of proximal ulna
  67. Aconeus action
    Assits triceps in extension of the elbow
  68. Aconeus innervation
    Radial nerve
  69. Brachioradialis innervation
    radial nerve
  70. Brachioradilis action
    flex forearm in midpronated (neutral postion)
  71. Brachioradialis attachments
    Proximal two-thirds of lateral supracondylar ridge and Letral surface of the distal radis ( radial styloid process )
  72. Extensor carpi radialis longus attachments
    Distal lateral suprcondylar ridge and base of second metacarpal
  73. Extensor carpi radialis longus actions
    Extends and aBducts the hand
  74. Extensor carpi radialis longus innervation
    Radial nerve
  75. Extensor carpi radialis brevis attachments
    • Later epicondyle of humerus via the common extensor tendon  
    • And, base of the 3rd metacarpal (the middle finger )
  76. Extensor carpi radialis brevis innervation
    Deep branch of the radial nerve
  77. Extensor carpi radialis brevis action
    Extend and aBducts the hand
  78. Extensor digitorum innervation
    Posterior interosseous nerve  which is the same thing as the deep branch of the radial nerve
  79. Extensor digitorum attachments
    • lateral epicondyle via the common extensor tendon  
    • And, the extensor expansions of digit 2-5 ( no thumb) the index, middle, ring, and pinky fingers
  80. Extensor digitorum actions
    Extends digits 2-5
  81. Extensor carpi ulnaris actions
    Extends and adducts the hand
  82. Extensor carpi ulnaris attachments
    lateral epicondyle via the common extensor tendon and base of firth metacarpal ( the pinky )
  83. Extensor carpi ulnaris innervation
    Posterior interosseous n.
  84. Supinator attachment
    • later epicondyle via the common extensor tendon 
    • and the proximal ulna
  85. Supinator actions
    Supinate forearm
  86. Supinator innervation
    Deep branch of the radial nerve
  87. Abductor pollicis longus attachment
    • Posterior surfaces of the radius, ulna, and interosseous membrane
    • and the base of the first metacarpal ( thumb)
  88. What muscles are attache to the Posterior surfaces of the radius, ulna, and interosseous membrane
    • Abductor pollicis longus 
    • extensor policis brevie
    • extensor pollicis longus
    • extensor indicis
  89. Abductor pollicis longus action
    Abducts and extends CMC of thumb
  90. Abductor pollicis longus innervation
    posterior interosseous nerve
  91. Extensor pollicis innervation
    posterior interosseous nerve
  92. Extensor pollicis brevis attachments
    • posterior surface of the radius, ulna, and the interosseous membrane 
    • and base of the distal phalanx of digit 1 ( the thumb)
  93. Extensor pollicis brevis action
    Extends MCP of the thumb( digit 1)
  94. Extensor pollicis longus action
    Extends MCP and IP of the thumb
  95. Extensor pollicis longus attachments
    • Posterior surfaces of the ulna, radius and the interosseous membrane
    • Base of distal phalanx of digit 1
  96. Extensor pollicis longus actions
    Extends MCP and IP of the thumb
  97. Extensor pollicis longus innervation
    posterior interosseous nerve
  98. Extensor indicis attachment
    • Posterior surfaces of the radius, ulna, and interosseous membrane
    • Extensor expansion of digit 2
  99. Extensor indicis action
    Extends digit 2
  100. Extensor indicis innervation
    Posterior interosseous nerve
Author
Iana
ID
352962
Card Set
Extensors of the Dorsum of the forearm
Description
baby got dorsum, but like of the hand
Updated