Final answer:
The frontal lobe contains the primary motor area responsible for initiating voluntary movements, specifically the primary motor cortex located in the precentral gyrus adjacent to other motor planning centers.
Step-by-step explanation:
The primary motor area in the frontal lobe is involved in the initiation of voluntary movements. This region of the brain, specifically known as the primary motor cortex, is situated in the precentral gyrus of the frontal lobe. Cells in this area are considered upper motor neurons, which send motor commands to the spinal cord and on to the skeletal muscles to produce movement. In addition to the primary motor cortex, the frontal lobe houses other important areas involved in planning and coordinating movement, such as the premotor area and Broca's area, which is crucial for the production of speech. The prefrontal cortex, also part of the frontal lobe, plays an important role in motor responses related to personality and decision-making.