軸丘(Axon hillock)是指神經元中細胞體靠近軸突的區域、緊鄰軸突初始段(initial segment)[1][2]。軸丘區域含有較多的電壓門控鈉離子通道[3],該區域也含有一定量的尼斯小體(粗糙內質網)[4]。
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