American Academy of Professional Coders (AAPC) Practice Exam 2025 - Free AAPC Practice Questions and Exam Prep Guide

The synovial membrane plays a crucial role in joint function by secreting synovial fluid, which serves to lubricate the joints. This lubricating fluid is essential for reducing friction between the articular cartilages of synovial joints during movement, allowing for a smoother and more efficient range of motion. The presence of synovial fluid also helps to nourish the cartilage and maintain healthy joint function by providing essential nutrients. This function is particularly important in preventing wear and tear on the joint surfaces over time.

While connecting two bones together, providing nutrients to surrounding tissue, and reinforcing the joint capsule are important functions related to joint health and stability, these actions are not directly performed by the synovial membrane. Instead, these functions are associated with structures such as ligaments, blood vessels, and the overall joint architecture. Thus, the primary and defining role of the synovial membrane is indeed the secretion of synovial fluid, which is essential for proper joint lubrication and function.