Which of the following describes nervous system signals to skeletal muscle fibers?
1) Autonomic neurons originate in the dorsal horn and send axons via the ventral nerve root
2) Somatic motor neurons originate in the ventral horn and send axons via the ventral nerve root
3) Somatic motor neurons originate in the dorsal horn and send axons via the dorsal nerve root
4) Autonomic neurons originate in the ventral horn and send axons via the dorsal nerve root