Final answer:
The interosseous membranes are sheets of dense connective tissue connecting the radius to the ulna in the forearm and the tibia to the fibula in the leg, aiding in stability and movement coordination.
Step-by-step explanation:
The interosseous membranes that connect the radius to the ulna in the forearm and the tibia to the fibula in the leg are crucial components of the skeletal system. These membranes are wide sheets of fibrous connective tissue that fill the gaps between the parallel bones. In the forearm, the interosseous membrane is essential for allowing the radius and ulna to strongly unite, while in the leg, it unites the shafts of the tibia and fibula. Furthermore, in the leg, these membranes are part of the tibiofibular syndesmosis, where fibrous connective tissue and ligaments also play a supporting role. The tibia is the primary weight-bearing bone in the leg, and the interosseous border of each bone serves as the attachment site for this connective tissue sheet, ensuring the stability and movement coordination between the tibia and fibula.