Extensor Digiti Minimi ( EDM ) Anatomy

Origin: Humerus (lateral epicondyle via common extensor tendon)

Intermuscular septum

Insertion: 5th digit (extensor hood)

Innervation: Cervical root(s): C7 and C8

Nerve: radial nerve (posterior interosseous branch)

Diagrams & Photos
  • Extensor Digiti Minimi (Fifth Finger Proprius Tendon)
    Extensor Digiti Minimi (Fifth Finger Proprius Tendon) with EDC & Juncturae
Videos
Extensor Digiti Minimi (Fifth Finger Proprius) Tendon
Key Points
  • EDM has two slips 70% of the time
  • The brain has independent control over the EDM
Anatomy References
Anatomic Abbreviations
Hand Surgery Resource Anatomy Diagnostic Guide (Chapter)