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1. Glossary

Periaqueductal gray

A core area in the brain stem that is involved in defensive behavior and fear and flight reflexes via close connections to the limbic system. It also plays an important role in pain suppression by regulating signals from the spinal cord to the brain. It is considered an endogenous pain control system and is an important target for medication.

1. Basics
2. Anatomy

The Mesencephalon

Important neurotransmitters, an astonishing array of colors, and a water pipe – that's the midbrain.

20.09.2025