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Extensors of the forearm
The forearm is the region of the
upper limb between the elbow joint
proximally and wrist joint distally
Forearm Extensors
The forearm is the region of the
upper limb between the elbow joint
proximally and wrist joint distally
Elbow Joint
Forear...
The forearm is the region of the
upper limb between the elbow joint
proximally and wrist joint distally
Elbow JointWrist J...
The forearm is the region of the
upper limb between the elbow joint
proximally and wrist joint distally
Elbow JointWrist J...
There are two long bones in the forearm
Forearm Extensors
There are two long bones in the forearm
Radius lies Laterally
Forearm Extensors
There are two long bones in the forearm
Radius
Ulna lies Medially
Forearm Extensors
The forearm is divided into 2 compartments by the
Interosseous membrane and the Deep Fascia
Interosseous membrane
Forearm ...
The forearm is divided into 2 compartments by the
Interosseous membrane and the Deep Fascia
Anterior Compartment or Flexor...
The forearm is divided into 4 compartments by the
Interosseous membrane and the Deep Fascia
Anterior Compartment or Flexor...
There are 2 groups of extensors;
• Superficial Extensor Compartment
• Deep Extensor compartment
Forearm Extensors
There are
• 7 muscles in the superficial group
• 5 muscles in the deep group
Forearm Extensors
Superficial Extensors
Forearm Extensors
Superficial Extensors
1.Brachioradialis
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
Collectively the...
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digit...
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digit...
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digit...
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digit...
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digit...
Deep Extensors
1.Abductor Pollicis Longus
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
3.Extensor Pollicis Brevis
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
3.Extensor Pollicis Brevis
4.Extensor Indicis
Forearm...
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
3.Extensor Pollicis Brevis
4.Extensor Indicis
5.Supin...
Tendons at the wrist
1
2
345
6
RadiusUlna
There are 6 compartments on
the dorsal aspect of the wrist
Forearm Extensors
First Compartment
1. Abductor Pollicis Longus
2. Extensor Pollicis Brevis
1
RadiusUlna
RadiusUlna
Forearm Extensors
Second Compartment
1. Extensor Carpi Radialis Longus
2. Extensor Carpi Radialis Brevis
RadiusUlna
2
Forearm Extensors
Third Compartment
Extensor Pollicis Longus
RadiusUlna
3
Forearm Extensors
Fourth Compartment
1. Extensor Indicis
2. Extensor Digitorum
RadiusUlna
4
Forearm Extensors
Fifth Compartment
Extensor Digiti Minimi
RadiusUlna
5
Forearm Extensors
Sixth Compartment
Extensor Carpi Ulnaris
RadiusUlna
6
Forearm Extensors
1. Abductor Pollicis Longus
1. Extensor Pollicis Brevis
2. Extensor Carpi Radialis Longus
2. Extensor Carpi Radialis Brevi...
Nerves
Brachioradialis
Extensor Carpi Radialis Longus
Anconeus
are supplied by the
Radial Nerve
Forearm Extensors
All the other extensor muscles
are supplied by the
Posterior Interosseous Nerve
deep branch of the Radial Nerve
Forearm Ex...
Summary of Muscles
Posterior Forearm
Brachioradialis
Origin Proximal 2/3 of lateral
supracondylar ridge of
humerus
Insertion Lateral surface ...
Extensor Carpi Radialis
Longus
Origin Lateral supracondylar ridge of
humerus
Insertion Base of 2nd metacarpal
Action Exten...
Posterior Forearm
Extensor Carpi Radialis
Brevis
Origin Lateral supracondylar ridge of
humerus
Insertion Base of 3rd metac...
Posterior Forearm
Extensor Digitorum
Origin Common extensor origin on
lateral epicondyle of humerus
Insertion Extensor exp...
Posterior Forearm
Extensor Digiti Minimi
Origin Common extensor origin on
lateral epicondyle of humerus
Insertion Extensor...
Posterior Forearm
Extensor Carpi Ulnaris
Origin Common extensor origin on
lateral epicondyle of humerus
Insertion Base of ...
Posterior Forearm
Anconeus
Origin Lateral epicondyle of humerus
Insertion Posterior olecranon process of
the ulna
Action E...
Posterior Forearm
Abductor Pollicis Longus
Origin Posterior surfaces of ulna,
radius and interosseous
membrane
Insertion B...
Posterior Forearm
Extensor Pollicis Longus
Origin Posterior surface of middle 1/3
of ulna and interosseous
membrane
Insert...
Posterior Forearm
Extensor Pollicis Brevis
Origin Posterior surfaces of radius
and interosseous membrane
Insertion Base of...
Posterior Forearm
Extensor Indicis
Origin Posterior surface of ulna and
interosseous membrane
Insertion Extensor expansion...
Posterior Forearm
Supinator
Origin Lateral epicondyle of humerus,
radial collateral and annular
ligaments, supinator fossa...
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Slideshow: Forearm Extensors

Slideshow: Forearm Extensors

The Funky Professor videos can be viewed here:
http://publishing.rcseng.ac.uk/journal/video?videoTaxonomy=FUNK

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Slideshow: Forearm Extensors

  1. 1. Extensors of the forearm
  2. 2. The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally Forearm Extensors
  3. 3. The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally Elbow Joint Forearm Extensors
  4. 4. The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally Elbow JointWrist Joint Forearm Extensors
  5. 5. The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally Elbow JointWrist Joint Forearm Forearm Extensors
  6. 6. There are two long bones in the forearm Forearm Extensors
  7. 7. There are two long bones in the forearm Radius lies Laterally Forearm Extensors
  8. 8. There are two long bones in the forearm Radius Ulna lies Medially Forearm Extensors
  9. 9. The forearm is divided into 2 compartments by the Interosseous membrane and the Deep Fascia Interosseous membrane Forearm Extensors
  10. 10. The forearm is divided into 2 compartments by the Interosseous membrane and the Deep Fascia Anterior Compartment or Flexor Compartment contain; • Superficial Flexors • Deep Flexors Forearm Extensors
  11. 11. The forearm is divided into 4 compartments by the Interosseous membrane and the Deep Fascia Anterior Compartment or Flexor Compartment contain; • Superficial Flexors • Deep Flexors Posterior Compartment or Extensor Compartment contain; • Extensors • Mobile Wad of Three Forearm Extensors
  12. 12. There are 2 groups of extensors; • Superficial Extensor Compartment • Deep Extensor compartment Forearm Extensors
  13. 13. There are • 7 muscles in the superficial group • 5 muscles in the deep group Forearm Extensors
  14. 14. Superficial Extensors Forearm Extensors
  15. 15. Superficial Extensors 1.Brachioradialis Forearm Extensors
  16. 16. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus Forearm Extensors
  17. 17. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis Forearm Extensors
  18. 18. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis Collectively these muscles are also called ‘The Mobile Wad of Three’ Forearm Extensors
  19. 19. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis 4.Extensor Digitorum Forearm Extensors
  20. 20. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis 4.Extensor Digitorum 5.Extensor Digiti Minimi Forearm Extensors
  21. 21. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis 4.Extensor Digitorum 5.Extensor Digiti Minimi 1.Extensor Carpi Ulnaris Forearm Extensors
  22. 22. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis 4.Extensor Digitorum 5.Extensor Digiti Minimi 1.Extensor Carpi Ulnaris 1.Anconeus Forearm Extensors
  23. 23. Superficial Extensors 1.Brachioradialis 2.Extensor Carpi Radialis Longus 3.Extensor Carpi Radialis Brevis 4.Extensor Digitorum 5.Extensor Digiti Minimi 1.Extensor Carpi Ulnaris 1.Anconeus Forearm Extensors
  24. 24. Deep Extensors 1.Abductor Pollicis Longus Forearm Extensors
  25. 25. Deep Extensors 1.Abductor Pollicis Longus 2.Extensor Pollicis Longus Forearm Extensors
  26. 26. Deep Extensors 1.Abductor Pollicis Longus 2.Extensor Pollicis Longus 3.Extensor Pollicis Brevis Forearm Extensors
  27. 27. Deep Extensors 1.Abductor Pollicis Longus 2.Extensor Pollicis Longus 3.Extensor Pollicis Brevis 4.Extensor Indicis Forearm Extensors
  28. 28. Deep Extensors 1.Abductor Pollicis Longus 2.Extensor Pollicis Longus 3.Extensor Pollicis Brevis 4.Extensor Indicis 5.Supinator Forearm Extensors
  29. 29. Tendons at the wrist
  30. 30. 1 2 345 6 RadiusUlna There are 6 compartments on the dorsal aspect of the wrist Forearm Extensors
  31. 31. First Compartment 1. Abductor Pollicis Longus 2. Extensor Pollicis Brevis 1 RadiusUlna RadiusUlna Forearm Extensors
  32. 32. Second Compartment 1. Extensor Carpi Radialis Longus 2. Extensor Carpi Radialis Brevis RadiusUlna 2 Forearm Extensors
  33. 33. Third Compartment Extensor Pollicis Longus RadiusUlna 3 Forearm Extensors
  34. 34. Fourth Compartment 1. Extensor Indicis 2. Extensor Digitorum RadiusUlna 4 Forearm Extensors
  35. 35. Fifth Compartment Extensor Digiti Minimi RadiusUlna 5 Forearm Extensors
  36. 36. Sixth Compartment Extensor Carpi Ulnaris RadiusUlna 6 Forearm Extensors
  37. 37. 1. Abductor Pollicis Longus 1. Extensor Pollicis Brevis 2. Extensor Carpi Radialis Longus 2. Extensor Carpi Radialis Brevis 3. Extensor Pollicis Longus 4. Extensor Indicis 4. Extensor Digitorum 5. Extensor Digiti Minimi 6. Extensor Carpi Ulnaris Forearm Extensors 1 2345 6 RadiusUln a
  38. 38. Nerves
  39. 39. Brachioradialis Extensor Carpi Radialis Longus Anconeus are supplied by the Radial Nerve Forearm Extensors
  40. 40. All the other extensor muscles are supplied by the Posterior Interosseous Nerve deep branch of the Radial Nerve Forearm Extensors
  41. 41. Summary of Muscles
  42. 42. Posterior Forearm Brachioradialis Origin Proximal 2/3 of lateral supracondylar ridge of humerus Insertion Lateral surface of distal end of radius (base of styloid process) Action Flexes forearm Nerve Supply Radial nerve (C5, C6 and C7) Blood Supply Radial recurrent artery
  43. 43. Extensor Carpi Radialis Longus Origin Lateral supracondylar ridge of humerus Insertion Base of 2nd metacarpal Action Extends and abducts hand at wrist joint Nerve Supply Radial nerve (C6 and C7) Blood Supply Radial artery Posterior Forearm
  44. 44. Posterior Forearm Extensor Carpi Radialis Brevis Origin Lateral supracondylar ridge of humerus Insertion Base of 3rd metacarpal Action Extends and abducts hand at wrist joint Nerve Supply Deep branch of radial nerve (C7 and C8) Blood Supply Radial artery
  45. 45. Posterior Forearm Extensor Digitorum Origin Common extensor origin on lateral epicondyle of humerus Insertion Extensor expansions of medial four digits (not thumb) Action Extends medial four digits at metacarpophalangeal joints; Extends hand at wrist joint Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Interosseous recurrent and posterior interosseous arteries
  46. 46. Posterior Forearm Extensor Digiti Minimi Origin Common extensor origin on lateral epicondyle of humerus Insertion Extensor expansion of little finger Action Extends 5th digit at metacarpophalangeal and interphalangeal joints Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Interosseous recurrent artery
  47. 47. Posterior Forearm Extensor Carpi Ulnaris Origin Common extensor origin on lateral epicondyle of humerus Insertion Base of 5th metacarpal Action Extends and adducts hand at wrist joint Nerve Supply Posterior interosseous nerve, (deep branch of radial nerve C7, C8) Blood Supply Ulnar artery
  48. 48. Posterior Forearm Anconeus Origin Lateral epicondyle of humerus Insertion Posterior olecranon process of the ulna Action Extends the elbow joint Nerve Supply Radial nerve (C7, C8) Blood Supply Posterior interosseous artery
  49. 49. Posterior Forearm Abductor Pollicis Longus Origin Posterior surfaces of ulna, radius and interosseous membrane Insertion Base of 1st metacarpal Action Abducts thumb, extends thumb at carpometacarpal joint Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Posterior interosseous artery
  50. 50. Posterior Forearm Extensor Pollicis Longus Origin Posterior surface of middle 1/3 of ulna and interosseous membrane Insertion Base of distal phalanx of thumb Action Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Posterior interosseous artery
  51. 51. Posterior Forearm Extensor Pollicis Brevis Origin Posterior surfaces of radius and interosseous membrane Insertion Base of proximal phalanx of thumb Action Extends proximal phalanx of thumb at carpometacarpal joint Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Posterior interosseous artery
  52. 52. Posterior Forearm Extensor Indicis Origin Posterior surface of ulna and interosseous membrane Insertion Extensor expansion of index finger Action Extends 2nd digit and helps to extend hand Nerve Supply Posterior interosseous nerve continuation deep branch radial nerve (C7, C8) Blood Supply Posterior interosseous artery
  53. 53. Posterior Forearm Supinator Origin Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa and crest of ulna Insertion Lateral, posterior and anterior surfaces of proximal 1/3 of radius Action Supinates forearm Nerve Supply Deep branch of radial nerve (C5 and C6) Blood Supply Recurrent interosseous artery

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Slideshow: Forearm Extensors The Funky Professor videos can be viewed here: http://publishing.rcseng.ac.uk/journal/video?videoTaxonomy=FUNK

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