The primary motor cortex is a region located in the frontal lobe of the brain, specifically in the precentral gyrus. It plays a crucial role in planning and executing voluntary movements by sending signals to the muscles throughout the body. This area is organized in a way that different parts correspond to different body regions, a concept known as the motor homunculus. Electrical stimulation of the primary motor cortex can trigger specific movements, highlighting its importance in motor control. Damage to this area can lead to motor deficits, affecting a person's ability to move certain body parts. Overall, the primary motor cortex is essential for coordinated and purposeful movement.