Final answer:
Contralateral innervation means that one side of the brain controls the opposite side of the body.
Step-by-step explanation:
Contralateral innervation refers to the phenomenon where the right side of the brain controls the left side of the body, and the left side of the brain controls the right side of the body. This is because the motor commands from the primary motor cortex cross the midline of the brainstem or spinal cord and synapse on the opposite side of the body. For example, the right motor cortex of the cerebrum controls muscles on the left side of the body, while the left motor cortex controls muscles on the right side of the body.