Holstege G (1998) The emotional motor system in relation to the supraspinal control of micturition and mating behavior. Behav brain Res. 92:2:103-9. doi: 10.1016/s0166-4328(97)00182-4. PMID: 9638952. INTRODUCTION As pointed out by Kuijper, the motor system in mammals and especially in humans, originates in the motor and premotor cortex, and only for the control of axial, neck and eye movements, in the brainstem. This system is called the somatic or voluntary motor system. However, many findings in the last 20 years indicate that there exist many other pathways that are derived from brain or brainstem structures belonging or related to the limbic system. This second system is called the emotional motor system.