Der Schmerz
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Visceral pain is diffusely localized, referred to deep somatic tissues, skin and viscera, frequently not correlated with an actual trauma, commonly correlated with strong negative affective reactions and accompanied by strong protective autonomic and motor reactions. It is correlated with the excitation of spinal (thoraco-lumbar, sacral) visceral afferents and (with a few exceptions) not with the excitation of vagal afferents. Spinal visceral afferents are polymodal and can be excited by physical and chemical stimuli. ⋯ Visceral nociception and pain is presumably (together with other visceral sensations and homeostatic regulations of autonomic body functions) primarily represented in the insula in the context of interoception. The insula obtains its main peripheral afferent input from lamina I neurons via the Nucleus ventromedialis posterior of the thalamus. The transmission of visceral impulses in the spinal cord is modulated by the endogenous control systems in the brain stem which are in turn under the control of cortex and limbic system.