Interosseous membrane of the forearm
Encyclopedia
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 Role of the Interosseous Membrane:
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.
Movement from Pronation to Supination:
As the forearm moves from Pronation to Supination the Interosseous membrane fibres change from a relaxed state, then become tense in the neutral position and then once again become relaxed as the forearm enters Supination.
Radius
In classical geometry, a radius of a circle or sphere is any line segment from its center to its perimeter. By extension, the radius of a circle or sphere is the length of any such segment, which is half the diameter. If the object does not have an obvious center, the term may refer to its...
and the ulna
Ulna
The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form and runs parallel to the radius, which is shorter and smaller. In anatomical position The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form...
. It is the main part of the radio-ulnar syndesmosis
Syndesmosis
A syndesmosis is slightly movable articulation where the contiguous bony surfaces are united by an interosseous ligament, as in the inferior tibiofibular articulation...
, a fibrous joint
Joint
A joint is the location at which two or more bones make contact. They are constructed to allow movement and provide mechanical support, and are classified structurally and functionally.-Classification:...
between the two bones.
The Role of the Interosseous Membrane:
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.
Movement from Pronation to Supination:
As the forearm moves from Pronation to Supination the Interosseous membrane fibres change from a relaxed state, then become tense in the neutral position and then once again become relaxed as the forearm enters Supination.
See also
- Anterior interosseous nerveAnterior interosseous nerveThe anterior interosseous nerve is a branch of the median nerve that supplies the deep muscles on the front of the forearm, except the ulnar half of the flexor digitorum profundus....
- Anterior interosseous artery
- Posterior interosseous nervePosterior interosseous nerveThe posterior interosseous nerve is a nerve in the forearm. It is the continuation of the deep branch of the radial nerve, after this has crossed the supinator muscle. It is considerably diminished in size compared to the deep branch of the radial nerve...
- Posterior interosseous arteryPosterior interosseous arteryThe posterior interosseous artery is an artery of the forearm.It passes backward between the oblique cord and the upper border of the interosseous membrane...
- Common interosseous arteryCommon interosseous arteryThe common interosseous artery, about 1 cm. in length, arises immediately below the tuberosity of the radius from the Ulnar artery.Passing backward to the upper border of the interosseous membrane, it divides into two branches, the anterior interosseous and posterior interosseous arteries....
- Recurrent interosseous artery