tertiary septum

例句：

1. 1. The tertiary septum is a critical structure in the development of the brain.
   三叉管瓣是大脑发育中的关键结构。
2. 2. The tertiary septum plays a crucial role in the formation of the neural tube.
   三叉管瓣在神经管的形成中起着至关重要的作用。
3. 3. The tertiary septum is responsible for the separation of the neural plate into its derivatives.
   三叉管瓣负责将神经板分离成其衍生物。