pyramidal tract

Motor neuron disease ( MND) is a kind of unexplained for violation of brainstem motor nerve, damage to the spinal cord anterior horn cells and pyramidal tract as the main features of chronic progressive disease variability.

运动神经元病（Motor Neuron Disease MND）是一种原因不明的以侵犯脑干运动神经、损害脊髓前角细胞和锥体束为主要特征的慢性进行性变异性疾病。

Conclusion It was suggested that the main damage of spastic cerebral palsy were motor cortex and pyramidal tract, the main lesion of athetoid cerebral palsy was extrapyramidal system.

结论（1）CMR异常改变提示痉挛型脑性瘫痪以运动皮层和锥体束损伤为主，手足徐动型脑性瘫痪以锥体外系损伤为主；

Progressive cerebellar ataxia was the main clinical symptom, other manifestations included extrapyramidal system and pyramidal tract sign and orthostatic hypotension. MRI showed atrophy olf cerebellum and brainstem.

临床表现为进行性小脑性共济失调，可伴有锥体外系症状，锥体束征及直立性低血压。

The capillary density of the central tegmental tract is the highest among the tracts observed and that of the pyramidal tract is the lowest.

纤维束中以被盖中央束的血管密度最高，锥体束的血管密度最低。