The supplementary motor area (SMA) is a region of the brain located on the medial surface of the frontal lobe, just in front of the primary motor cortex. It plays a crucial role in planning and coordinating voluntary movements, particularly those that involve both sides of the body. The SMA is involved in the preparation and execution of complex motor tasks. Additionally, the SMA is connected to other areas of the brain, including the premotor cortex and basal ganglia, which help integrate sensory information and refine motor actions. It is also important for tasks that require timing and sequencing, contributing to the smooth execution of movements.