1) Primary 2) Primitive 
Denoting a supposedly primitive set or system of peripheral sensory nerve fibres conducting a low order of pain and temperature sensibility which is poorly localised. ... Compare: epicritic. ... Origin: proto-+ G. Pathos, suffering ... (05 Mar 2000) ... 
Type: Term Pronunciation: prō′tō-path′ik Definitions: 1. Denoting a supposedly primitive set or system of peripheral sensory nerve fibers conducting a low order of pain and temperature sensibility that is poorly localized.
protopathic Stimuli and nerve systems concerned with sensation of pain and of marked variations in temperature.
noting or pertaining to a general, nondiscriminating responsiveness to pain or temperature stimuli (opposed to epicritic). · primitive; primary.