Gray matter 2)Intermediate zone Intermediolateral nucleus:中间外侧核 lies in segments T1-L3, containing 中央管 胸核 sym pathetic preganglionic neurons 胶状质 交感神经的低级中枢 后角边缘核 Sacral parasympathetic nucleus骶副 后角固有核 交感核: lies in segments S2~S4,副交 感神经的低级中枢 中间内侧核 ntermediomedial nucleus中间内侧核 for sensation of viscera 中间外侧核
Gray matter ◼ Sacral parasympathetic nucleus 骶副 交感核： lies in segments S2~S4, 副交 感神经的低级中枢 ◼ Intermediomedial nucleus 中间内侧核: for sensation of viscera 2) Intermediate zone ◼ Intermediaolateral nucleus:中间外侧核 lies in segments T1~L3, containing sympathetic preganglionic neurons 交感神经的低级中枢
Gray matter 3)Anterior horn (column): contain motor neurons (a-motor neuron: larger multipolar neuron-支配骨骼肌, 管理随意运动 中央管 胶状质 灰质后连合 (2y-motor neuron: smaller 胶状质 后角固有核 neuron, innervates intrafusal fibers regulating muscular tonus 调节肌张力 中间内侧核 网状结构 ③ Renshaw cell:抑制α-神经 前角 灰质前连合 前角运动细胞
Gray matter ①α-motor neuron: larger multipolar neuron---支配骨骼肌, 管理随意运动., ②γ-motor neuron: smaller neuron, innervates intrafusal fibers regulating muscular tonus- --调节肌张力. 3) Anterior horn (column): contain motor neurons ③ Renshaw’s cell: 抑制α-神经 元
Gray matter 3)Anterior horn (column) Two groups of nuclei 后角固有核 ① Medial nuclear group 前角内侧核 present in most segments of 中间内侧核 spinal cord, innervating axial ∴ muscles 中间外侧核 ② Lateral nuclear group 前角外侧核 present only in cervical and lumbosacral enlargements enervating limb muscles 前角运动细胞
Gray matter Two groups of nuclei ① Medial nuclear group 前角内侧核: present in most segments of spinal cord, innervating axial muscles. ② Lateral nuclear group 前角外侧核: present only in cervical and lumbosacral enlargements, innervating limb muscles 3) Anterior horn (column):