The<unk>  theory of pain states that the perception of painful stimuli does not result from the brain's passive registration of tissue trauma, but from its active generation of subjective experiences through a network of neurons known as the<unk> . The theory was proposed by Ronald Melzack in 1990. Recent research has identified the anterior cingulate cortex as a critical part of the<unk> .
Neuromatrix
Neurosphere
Dermatome
Dermatome 
DermAtlas
Chondrocranium
Epicles
Fibrous cap