Intrinsic brain activity triggers trigeminal meningeal afferents in a migraine model

Migraine headaches involve the trigeminal nerve and complex triggering mechanisms. This study links migraine aura to headache development. Researchers demonstrated that cortical spreading depression activates trigeminovascular afferents. This activation triggers meningeal and brainstem events leading to headaches. Cortical spreading depression also enhances blood flow in the middle meningeal artery. This enhancement requires activation of trigeminal and parasympathetic systems. Additionally, plasma protein leakage occurs within the dura mater. This leakage is partly due to a neurokinin-1-receptor mechanism. The findings reveal how extracerebral blood flow connects to brain activity. This connection explains vasodilation during headaches. It also links intense brain activity to headache pain transmission. Overall, this research deepens our understanding of migraine mechanisms. It may pave the way for improved treatments targeting these pathways. Understanding these processes could enhance migraine management and patient outcomes significantly. Clinical relevance: This research shows how brain activity influences migraine pain, guiding future treatments.