查看运动神经元的源代码

跳转到:导航，搜索

您没有编辑此页的权限，原因如下:

您请求的操作仅限于组中的用户:==下运动神经元== [[File:Motor neuron.jpg|右|无框|500x500px]]下运动神经元负责将上运动神经元的信号传递给效应器肌肉，以执行动作。下运动神经元有三大类:躯体运动神经元、特殊内脏传出(鳃)运动神经元和一般内脏运动神经元。“体细胞运动神经元”位于脑干中，并进一步分为三类:α， β和γ。运动神经元支配外肌纤维，是骨骼肌收缩的主要手段。大的α运动神经元胞体既可以在脑干，也可以在脊髓。在脊髓中，细胞体位于前角，因此称为前角细胞。从前角细胞，单个轴突继续支配单个肌肉内的许多肌肉纤维。这些肌纤维的特性几乎是相同的，允许在下运动神经元去极化时控制运动单元的同步运动。# β运动神经元的特征不明确，但已经确定它们支配外渗纤维和内渗纤维。#运动神经元支配肌肉纺锤体并决定其敏感性。 These neurons primarily respond to stretch of the muscle spindle. Despite being named a “motor neuron,” these neurons do not directly cause any motor function. It is thought that they get activated along with alpha motor neurons and fine-tune the muscle contraction (alpha-gamma coactivation). A disruption in either alpha or gamma motor neurons will result in a disruption of muscle tone '''Branchial motor neurons''' (or special visceral neurones) innervate the muscles of the head and neck that derive from the branchial arches (typically, six arches in vertebrates; in lower vertebrates, they bear gills; they are pharyngeal arches in human embryos). * Located in the brainstem. * The branchial motor neurons and sensory neurons together form the nuclei of [[Cranial Nerves|cranial nerves]] V, VII, IX, X, and XI. '''General visceral motoneurons''' contribute to both the sympathetic and parasympathetic functions of the autonomic nervous system. * Directly involved in the contractions of the heart, the muscles of the arteries, and other viscera that are not consciously controlled.

回到 检索自"http:///Motor_Neurone＂

周二获得最佳提示和最新的Physiopedia更新

是的,请

我们的合作伙伴