Yamamoto M, Akita M, Imagawa T, Uehara M
Department of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Tottori, Japan.
Brain Res Bull. 2001 Jan 15;54(2):159-65. doi: 10.1016/s0361-9230(00)00443-3.
In the cervical and lumbosacral enlargements of the chicken, there are seven spinocerebellar nuclei, the Clarke's column, the spinal border cells, the ventral margin of the ventral horn of both enlargements, and the ventral marginal nucleus in the lumbosacral enlargement. In the present study, we investigated the laterality of spinocerebellar tract axons and the distribution of the spinocerebellar tract neurons projecting into the anterior or posterior part of the cerebellum in these seven nuclei by retrograde transport of wheat germ agglutinin-horseradish peroxidase. The spinocerebellar tract neurons with uncrossed axons were found in the cervical Clarke's column and the cervical spinal border cells, and with crossed ones in the lumbar Clarke's column, lumbar spinal border cells, lumbar lamina IX included in the ventral margin of the ventral horn of the lumbosacral enlargement, and the ventral marginal nucleus. The ventral margin of the ventral horn of the cervical enlargement and lumbar lamina VIII included in the ventral margin of the ventral horn of the lumbosacral enlargement issued spinocerebellar tract axons bilaterally. The spinocerebellar tract neurons of the lumbar spinal border cells and lumbar lamina IX projected to the anterior part of the cerebellum only. And those of the other nuclei projected to both the anterior and posterior parts.
在鸡的颈膨大与腰骶膨大处，存在七个脊髓小脑核、克拉克柱、脊髓边界细胞、两个膨大处腹角的腹侧边缘以及腰骶膨大处的腹侧边缘核。在本研究中，我们通过小麦胚凝集素 - 辣根过氧化物酶的逆行运输，研究了这七个核中脊髓小脑束轴突的偏侧性以及投射到小脑前部或后部的脊髓小脑束神经元的分布。在颈段克拉克柱和颈段脊髓边界细胞中发现了轴突未交叉的脊髓小脑束神经元，而在腰段克拉克柱、腰段脊髓边界细胞、腰骶膨大处腹角腹侧边缘所包含的腰段第IX层以及腹侧边缘核中发现了轴突交叉的神经元。颈膨大处腹角的腹侧边缘以及腰骶膨大处腹角腹侧边缘所包含的腰段第VIII层发出双侧的脊髓小脑束轴突。腰段脊髓边界细胞和腰段第IX层的脊髓小脑束神经元仅投射到小脑前部。而其他核的神经元则投射到小脑的前部和后部。
