Interosseous membrane of forearm

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Interosseous membrane of forearm
Image of human elbow and forearm. Interosseous membrane labeled at bottom center.
Latin membrana interossea antebrachii
TA A03.5.06.002
FMA 23706
Anatomical terminology

The interosseous membrane of the forearm (rarely middle or intermediate radioulnar joint) is a fibrous sheet that connects the radius and the ulna. It is the main part of the radio-ulnar syndesmosis, a fibrous joint between the two bones.


The interosseus membrane divides the forearm into anterior and posterior compartments, serves as a site of attachment for muscles of the forearm, and transfers forces from the radius, to the ulna, to the humerus. As the forearm moves from pronation to supination, the interosseous membrane fibres change from a relaxed state, to a tense state in the neutral position. They once again become relaxed as the forearm enters supination.

The interosseous membrane is composed of 5 ligaments:

  1. - Central band (key portion to be reconstructed in case of injury)
  2. - Accessory band
  3. - Distal oblique bundle
  4. - Proximal oblique cord
  5. - Dorsal oblique accessory cord
The interosseous membrane is composed of 5 ligaments:- Central band (key portion to be reconstructed in case of injury)- Accessory band- Distal oblique bundle- Proximal oblique cord- Dorsal oblique accessory cord

See also[edit]