What triggers headache sensations?

What triggers headache sensations?

• A. Inflammation of brain parenchyma
• B. Activation of meningeal nociceptors due to elevated or reduced intracranial pressure
• C. Spreading of cortical electrical activity
• D. Dilation of scalp arteries

Answer: (B)

Headache pain comes from the pain-sensing fibers in the meninges and dural vessels, which are innervated by the trigeminal system. When intracranial pressure rises or falls, these tissues are stretched or irritated, activating those meningeal nociceptors and sending pain signals to the brain. The brain itself lacks pain receptors, so inflammation inside the brain (parenchyma) doesn’t directly produce headache. Cortical electrical activity spreading can be linked to migraine aura and may influence nearby trigeminal pathways, but the immediate trigger for headache sensation is the activation of meningeal nociceptors by pressure changes. Dilation of scalp arteries can contribute to pain, yet the most direct and common trigger described here is the pressure-related activation of those meningeal nociceptors.

Headache pain comes from the pain-sensing fibers in the meninges and dural vessels, which are innervated by the trigeminal system. When intracranial pressure rises or falls, these tissues are stretched or irritated, activating those meningeal nociceptors and sending pain signals to the brain. The brain itself lacks pain receptors, so inflammation inside the brain (parenchyma) doesn’t directly produce headache. Cortical electrical activity spreading can be linked to migraine aura and may influence nearby trigeminal pathways, but the immediate trigger for headache sensation is the activation of meningeal nociceptors by pressure changes. Dilation of scalp arteries can contribute to pain, yet the most direct and common trigger described here is the pressure-related activation of those meningeal nociceptors.