Interosseous membrane

A fibrous sheet that connects two bones and provides support and stability.

The interosseous membrane is a thin layer of dense connective tissue that connects the shafts of two long bones. In the human body, it primarily exists between the radius and ulna in the forearm, as well as between the tibia and fibula in the leg. This membrane not only provides a surface for muscle attachment but also plays a significant role in the distribution of forces across the bones it connects.

Terminologia Anatomica

membrana interossea

System

Skeletal system

Function

The interosseous membrane serves several essential functions within the body. Primarily, it maintains the space between the two bones it connects, allowing for proper movement and function of the joints. This stabilizing role is crucial during activities that involve force distribution, such as walking or lifting. Furthermore, the interosseous membrane acts as an attachment site for various muscles. In the forearm, for instance, it provides anchorage for the muscles involved in pronation and supination, which are necessary for rotating the wrist and forearm. Additionally, by connecting the bones, the membrane helps to transfer load and reduce the risk of injury during physical activities.

Location

The interosseous membrane is located in two primary regions of the body: the forearm and the leg. In the forearm, it extends between the radius, which is the outer bone of the forearm, and the ulna, which is the inner bone closest to the body. It runs parallel to both bones, covering a length of approximately 25 centimeters, depending on individual anatomy. In the leg, the interosseous membrane is found between the tibia and fibula, parallel to these bones as well. Here, it helps maintain the integrity and positioning of these bones, aiding in functions such as walking and jumping. The structure of this membrane allows it to adapt and withstand various stresses throughout its locations.

Did You Know?

The interosseous membrane is crucial for the efficient functioning of the forearm's rotation, allowing complex wrist movements.
In addition to its stabilizing role, the interosseous membrane can also assist in forearm and leg muscle function by serving as a site for muscle attachment.
Damage or injury to the interosseous membrane can lead to serious issues, including instability in the wrist or ankle.
The interosseous membranes can also act as shock absorbers, reducing the impact during high-stress physical activities.