Periaqueductal Gray

**Definition:** Central gray matter surrounding the CEREBRAL AQUEDUCT in the MESENCEPHALON. Physiologically it is probably involved in RAGE reactions, the LORDOSIS REFLEX; FEEDING responses, bladder tonus, and pain.

**Tree numbers:** - A08.186.211.132.659.413.875.595

**Synonyms:** - Midbrain Central Gray - Periaqueductal Gray Matter - Substantia Grisea Centralis - Central Gray Substance of Midbrain - Griseum Centrale - Griseum Centrale Mesencephali - Substantia Grisea Centralis Mesencephali - Mesencephalic Central Gray - Central Periaqueductal Gray