Tracts的用法和樣例：
例句
- Neurons are concentrated in clusters with defined nerve tracts leading in and out.
神經(jīng)元聚集成束，束定義為引進(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.
中腦核包括四條運動(dòng)束，用以傳送上位運動(dòng)神經(jīng)元的軸突經(jīng)脊髓至下運動(dòng)神經(jīng)元。
