There are four main sources of pain and each produces a specific pattern of pain. Central Somatic Structures E.g. Dura mater, posterior longitudinal ligament, annulus fibrosus of the intervertebral disc Mulisegmental pain This can be central, central unilateral, bilateral, proximal or distal Referred tenderness 2. Central Neurological Structures E.g. Spinal cord No pain Multisegmental reference of parasthesia (bilateral hands and/or feet) Upper motor neuron lesion: spastic muscle weakness, increased reflexes, spastic gait, extensor plantar response (Babinski reflex) 3. Unilateral Somatic Structures E.g....