Corpus: Middle finger

The middle finger is the 3rd finger of the human hand. It consists of 3 phalanges, the proximal, middle and distal or nail phalanx.

Bone[Bearbeiten]

Each phalanx is based on a short tubular bone, the proximal phalanx, the middle phalanx and the distal phalanx.

Joints[Bearbeiten]

The metacarpophalangeal joint of the finger is a saddle joint with limited movement in 2 main axes. It allows flexion and extension, as well as abduction and adduction. The metacarpophalangeal joint is fixed by two collateral ligaments (ligamenta collateralia), an ulnar and a radial ligament.

The middle and end joints of the middle finger are hinge joints that enable extension and flexion. They lie between the phalanges. Both joints are also fixed by collateral ligaments.

Muscles[Bearbeiten]

The following muscles are responsible for the movement of the middle finger.

• extensor digitorum
  • Extensor digitorum muscle
• Flexion
  • Musculus flexor digitorum superficialis
  • Musculus flexor digitorum profundus
• Abduction
  • Musculi interossei dorsales
• Adduction
  • Musculi interossei palmares

The tendon of the flexor digitorum profundus muscle is surrounded by a tendon sheath, the vagina synovialis digiti III.