Interosseous membrane

Interosseous Membrane refers to a fibrous sheet that connects the bones of the forearm (radius and ulna) and the bones of the leg (tibia and fibula). These membranes play a crucial role in the stability and function of the forearm and lower leg, facilitating the transmission of forces and serving as sites for muscle attachment.

Anatomy

The interosseous membrane of the forearm, also known as the interosseous membrane of the forearm, extends between the interosseous borders of the radius and ulna. It is part of the radioulnar joints complex, contributing to the stability of the proximal and distal radioulnar joints. The membrane is oriented obliquely, with its fibers running in a direction from the radius (lateral side) to the ulna (medial side).

The interosseous membrane of the lower leg, also known as the interosseous membrane of the leg, stretches between the tibia and fibula. It is a key component of the syndesmosis joint, a fibrous joint that provides stability to the tibia and fibula. Similar to its counterpart in the forearm, the fibers of the leg's interosseous membrane run obliquely, but in this case, from the tibia (medial side) to the fibula (lateral side).

Function

The primary function of the interosseous membranes is to maintain the proper spacing between the bones they connect, ensuring stability and efficient force transmission during movement. In the forearm, the interosseous membrane allows for the transfer of forces from the hand to the forearm and then to the upper arm, facilitating various movements and load-bearing activities. In the lower leg, it plays a crucial role in weight-bearing and in stabilizing the ankle and foot during walking or running.

Additionally, the interosseous membranes serve as attachment sites for several muscles. In the forearm, muscles such as the interosseous muscles attach to the membrane, aiding in movements of the fingers and thumb. In the lower leg, it provides attachment points for muscles involved in movements of the foot.

Clinical Significance

Injuries to the interosseous membrane, such as tears or ruptures, can occur due to trauma or overuse. In the forearm, such injuries can compromise the stability of the radioulnar joint, affecting forearm rotation. In the lower leg, damage to the interosseous membrane can affect the stability of the syndesmosis joint, leading to altered gait and pain.

Treatment for interosseous membrane injuries typically involves rest, immobilization, and physical therapy. In severe cases, surgical intervention may be necessary to repair the damaged membrane and restore function.

See Also

• Radius (bone)
• Ulna
• Tibia
• Fibula
• Syndesmosis joint
• Radioulnar joint

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