Primitive reflexes (PRs) are involuntary motor responses that establish foundational postural tone, orientation, and motor-sensory coordination during early development. These reflexes should integrate as higher cortical control matures. When they remain active—or reactivate in the context of trauma, emotional stress, neuroinflammation, or structural compromise—they produce persistent motor patterns that disrupt movement, stability, and autonomic regulation.In clinical settings, retained PRs do not present abstractly. They express through specific, reproducible fascial bracing patterns, muscle spasticity, and sinew channel fixation. These patterns impair functional mobility, destabilize postural tone, and often correlate with elevated sympathetic drive, reduced vagal tone, and impaired cranial nerve regulation.