Final answer:
The tracts of the brain involved in motor control of skeletal muscle include the corticospinal tract, composed of upper and lower motor neurons.
Step-by-step explanation:
The tracts of the brain involved in motor control of the skeletal muscle include the corticospinal tract. This tract is composed of two neurons: the upper motor neuron and the lower motor neuron. The upper motor neuron has its cell body in the primary motor cortex of the frontal lobe and synapses on the lower motor neuron, which is located in the ventral horn of the spinal cord and projects to the skeletal muscle in the periphery.