Which part of the brain has the most motor connections and is the location for the upper motor neurons

cerebral cortex

Explanation:

Upper motor neurons are located in your brain and spinal cord. They send signals to lower motor neurons.

The upper motor neurons originate in the cerebral cortex and travel down to the brain stem or spinal cord, while the lower motor neurons begin in the spinal cord and go on to innervate muscles and glands throughout the body.

i think it is dna, i'm not totally sure but i think it might be.