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第三节神经系统的感觉功能各种感受器受到环境刺激引起兴奋后,便通过传入神经传到中枢。传入冲动在中枢主要通过特异和非特异投射两个系统向大脑传递。一、特异性传导系统特异性传导系统是由三个神经元的接替完成的。第一级神经元位于脊神经节或有关的脑神经感觉神经节内,第二级神经元位于脊髓后角或脑干的有关神经核内,第三级神经元在丘脑的感觉接替核内,然后投射到大脑皮质,其投射有以下特点:每一种感觉的传导投射都是专一的,各种感觉上传都有固定的传导途径;一侧躯体感觉投射到对测中央后回,呈交叉投射关系(但头面部感觉投射是双侧
The third section of the sensory function of the nervous system by a variety of receptors excitement caused by environmental stimuli, they pass through the afferent nerve to the center. Incoming impulses are delivered to the brain mainly through two systems, specific and non-specific. First, the specific conduction system-specific conduction system is completed by the successor of three neurons. The first level neurons are located in the dorsal root ganglia or related brain sensory ganglia, the second level neurons are located in the posterior horn of the spinal cord or in the relevant nucleus of the brainstem, and the third level neurons in the thalamic sensory succession nucleus then Projected to the cerebral cortex, the projection has the following characteristics: Each kind of sensory conduction projection is specific, a variety of sensory upload has a fixed transmission pathway; side of the somatosensory projection to the measured central back, cross projection Relationship (but head and face projection is bilateral