The pain sensory system The primary afferent nociceptor (初级传入伤害感受器) A peripheral nerve(外周神经) consists of axons (轴索)of three different types of neurons(神经元) primary sensory afferents(初级感觉传入) motor neurons(运动神经元) sympathetic postganglionic neurons(交感神经节后神经元) The cell bodies of primary afferents: located in the dorsal root ganglia in the vertebral forminaThe pain sensory system The primary afferent nociceptor: (初级传入伤害感受器) •A peripheral nerve (外周神经)consists of axons (轴索)of three different types of neurons (神经元): primary sensory afferents(初级感觉传入) motor neurons(运动神经元) sympathetic postganglionic neurons(交感神经节后神经元) •The cell bodies of primary afferents: located in the dorsal root ganglia in the vertebral formina