后脑位于大脑后端的下方，由小脑、脑桥和延髓构成。

The hindbrain sits underneath the back end of the cerebrum, and it consists of the cerebellum, pons, and medulla.

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次常见的病灶部位分布于脑桥延髓区，约40%的患者可见此改变。

The next most common location of involvement was the pontobulbar region, seen in 40% of the cases.

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实验结果表明：rtn和脑桥及延髓的呼吸相关结构之间存在纤维联系。

The above results show that the RTN has axonal connections with the pontine and medullary respiratory related structures.

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