The periaqueductal gray (PAG) in the midbrain is important for coordination of various muscle groups involved in phonation.The facts have been confirmed in cats and monkeys.

• 摘要发声的中枢神经控制中，中脑导水管周围灰质是协调喉部及呼吸肌肉作用，产生音声的重要枢纽。