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Neurons are concentrated in clusters with defined nerve tracts leading in and out. 神經(jīng)元聚集成束，束定義爲(wèi)引進(jìn)引出的神經(jīng)束。
The midbrain nuclei include four motor tracts that send upper motor neuronal axons down the spinal cord to lower motor neurons. 中腦核包括四條運(yùn)動束，用以傳送上位運(yùn)動神經(jīng)元的軸突經(jīng)脊髓至下運(yùn)動神經(jīng)元。