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Figure 1: Schematic diagram of the central and peripheral pathways thought to be involved in the pathophysiology of cluster headache. Image copyright of 'Headache Academy', reproduced with permission. ACC, anterior cingulate cortex; C1, first cervical nerve root; C2, second cervical nerve root; ICA, internal carotid artery; PFC, prefrontal cortex; PH, posterior hypothalamus; SCG, superior cervical ganglion; SPG, sphenopalatine ganglion; SSC, somatosensory cortex; SSN, superior salivatory nucleus; TNC, trigeminal nucleus caudalis

Figure 1: Schematic diagram of the central and peripheral pathways thought to be involved in the pathophysiology of cluster headache. Image copyright of 'Headache Academy', reproduced with permission. ACC, anterior cingulate cortex; C1, first cervical nerve root; C2, second cervical nerve root; ICA, internal carotid artery; PFC, prefrontal cortex; PH, posterior hypothalamus; SCG, superior cervical ganglion; SPG, sphenopalatine ganglion; SSC, somatosensory cortex; SSN, superior salivatory nucleus; TNC, trigeminal nucleus caudalis