periaqueductal gray matter

例句：

1. 1. The periaqueductalgray matter is crucial for the proper functioning of the brain.
   脑干灰质对于大脑的正常功能至关重要。
2. 2. The studyfound that the periaqueductal gray matter playsa significant role in memory formation.
   研究发现，脑干灰质在记忆形成中起着重要作用。
3. 3. The researchers are conducting experimentsto investigate the effects of various drugs onthe periaqueductal gray matter.
   研究人员正在进行实验，以研究各种药物对脑干灰质的影响。