Final answer:
The corticospinal tract in the brain is responsible for voluntary movement of contralateral limbs.
Step-by-step explanation:
The corticospinal tract in the brain is responsible for voluntary movement of contralateral limbs. The axons of the corticospinal tract cross the midline of the brain stem or spinal cord and synapse on the opposite side of the body. Therefore, the right motor cortex of the cerebrum controls muscles on the left side of the body, and vice versa.