Final answer:
The neurotransmitter used in the somatic motor division is acetylcholine (ACh).
Step-by-step explanation:
The neurotransmitter used in the somatic motor division is acetylcholine (ACh). Acetylcholine is released by motor neurons in order to activate muscles in the somatic nervous system. It is also the neurotransmitter used at the neuromuscular junction and is involved in the excitation of skeletal muscles. ACh is a crucial neurotransmitter for voluntary activities controlled by the somatic motor division.