Final answer:
Lower motor neurons are the type described, originating in the spinal cord or brain stem, with long axons that travel in nerves to stimulate skeletal muscle contraction as part of the somatic nervous system.
Step-by-step explanation:
The motor neurons that are described in the question are known as lower motor neurons. These neurons originate either in the spinal cord or in the brain stem, and their axons travel within nerves to stimulate skeletal muscle fibers causing them to contract. They are part of the somatic nervous system and are essential for voluntary muscle movements. Lower motor neurons in the ventral horn of the spinal cord send axons through the ventral root to join spinal nerves and reach the skeletal muscles. Axons can be very long, reaching up to a meter in length to connect to muscles across the body, such as the lumbar motor neurons innervating muscles in the toes.