The third group, ventral group was located in medial to the lateral motor column and among the motor neurons and their cell bodies were medium sized. Some large multipolar neurons also became CaBP positive in these group. 腹侧群位于外侧运动柱的内侧或运动神经元之间,为中等大小的神经元,部分大多极神经元也呈现阳性。