起源于脊髓以上部位的Muller神经元的巨纤维轴突常见两侧对称或类对称呈现，而荧光镜检表明中央管下面的灰质具有相当密集的5-HT神经元。
Giant fibers from Muller neurons were mostly symmetrically or quasi-symmetrically distributed . Dense 5-HT neurons could be seen in the central region of the spinal cord by fluorescence microscope .
巨轴突