Interosseous membrane of leg

Interosseous membrane of leg (in red)

The Interosseous Membrane of Leg (also known as the Crural Interosseous Membrane) is a fibrous sheet that connects the two bones of the lower leg, the Tibia and Fibula. It is a thin, yet strong membrane that plays a crucial role in the stability of the leg and the distribution of forces during weight-bearing activities.

Structure

The Interosseous Membrane of Leg extends from the Interosseous crest of the tibia to the interosseous crest of the fibula. It is composed of dense, fibrous connective tissue. The fibers of the membrane are oriented obliquely, running downward and laterally from the tibia to the fibula. This orientation allows the membrane to effectively transmit forces from the weight-bearing tibia to the non-weight-bearing fibula.

Function

The primary function of the Interosseous Membrane of Leg is to provide stability to the leg by preventing the separation of the tibia and fibula. It also serves as an attachment site for muscles, including the Tibialis anterior, Extensor digitorum longus, and Peroneus Tertius.

In addition to providing stability, the Interosseous Membrane of Leg also plays a role in distributing forces during weight-bearing activities. It transfers a portion of the axial load from the weight-bearing tibia to the non-weight-bearing fibula, thereby helping to distribute the load evenly across the leg.

Clinical Significance

Injuries to the Interosseous Membrane of Leg can occur as a result of trauma, such as a fracture of the lower leg bones. Such injuries can lead to instability of the leg and impaired weight-bearing capacity. Treatment typically involves immobilization of the leg to allow the membrane to heal.

See Also

• Interosseous Membrane of Arm
• Lower Extremity Anatomy