Flexor Digitorum Profundus Anatomy

Flexor Digitorum Profundus Muscle

Origin:   Anteromedial surfaces of the superior three-quarters of the ulna and adjacent interosseous membrane
Insertion:  Volar surface of the distal phalanx of the four digits
Actions: Flexion of the digits
Innervation: Ulnar Nerve (C8, T1 ) and Anterior Interosseous Branch of the Median Nerve
Blood Supply: Muscular branches and the anterior interosseous artery from the ulnar artery and muscular branches from the radial artery

Primary Actions of the Flexor Digitorum Profundus

1.  Flexion of the digits at the proximal interphalangeal joints

  Agonists:

  • Flexor Digitorum Superficialis

  Antagonists:

  • Lumbricals
  • Dorsal Interossei
  • Palmar Interossei
  • Extensor Digitorum
  • Extensor Indicis (second digit)
  • Extensor Digiti Minimi (fifth digit)

2. Flexion of the digits at the distal interphalangeal joints

  Agonists: None

  Antagonists:

  • Lumbricals
  • Dorsal Interossei
  • Palmar Interossei
  • Extensor Digitorum
  • Extensor Indicis (second digit)
  • Extensor Digiti Minimi (fifth digit)

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Secondary Actions of the Flexor Digitorum Profundus

1. Assists with flexion of the digits at the metacarpophalangeal joints

  Agonists:

  • Flexor Digitorum Superficialis
  • Dorsal Interossei
  • Flexor Digiti Minimi (fifth digit)
  • Palmar Interossei
  • Lumbricals

  Antagonists:

  • Extensor Digitorum
  • Extensor Indicis
  • Extensor Digiti Minimi

2. Assists with flexion of the wrist

  Agonists: 

  • Flexor Carpi Radialis
  • Palmaris Longus
  • Flexor Carpi Ulnaris

  Antagonists:

  • Extensor Carpi Radialis Longus
  • Extensor Carpi Radialis Brevis
  • Extensor Carpi Ulnaris