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Extensor digitorum

Contents

Anatomy pictures

Extensor digitorum - posterior view
Extensor digitorum - lateral view

Referred pain pattern

Extensor Digitorum - pain pattern

Muscle type

  • Phasic
    • Weakens when overactivated

Symptoms

  • Weakness of grip
  • Problems gripping items
  • Loss of full flexion of fingers

Muscle attachment zones

Origin zone of extensor tendons (extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris and extensor digiti minimi)

Videos

Short version

 

Detailed version

Myofascial lines

Superficial dorsal arm line

Anatomy

Position

  • Superficial

Origin

  • Lateral epicondylus humeri
  • Fascia anterbrachii
  • Septa intermuscularia

Insertion

  • Dorsal aponeurosis of 2.-5. fingers

Main function

  • MCP-joint:
    • Extension
  • PIP:
    • Extension
  • DIP:
    • Extension
  • Wrist:
    • Extension

Secondary function

  • Wrist:
    • Radial deviation
  • CMC 5:
    • Medial rotation
  • Elbow:
    • Extension

Nerve innervation

  • Segmental:
    • C7-C8
  • Peripheral:
    • Nervus radialis

Arterial supply

  • Posterior interossesus artery