dorsal nucleus of vagus nerve

例句：

1. 1. The dorsal fin is the main fins of fish.
   鱼的背鳍是主要鳍。
2. 2. The dorsal fin is a primary feature of many species of fish.
   许多物种的鱼都有背鳍这一主要特征。
3. 3.In the dorsal region of the brain, there are several areas responsible for motor control.
   在大脑的背部区域，有几个负责运动控制的区块。