The excerpt shown above is from a 3D stereoscopic moa animation explaining process of migraine attack. Migraines begin when neurons in the brain start misfiring in response to internal or environmental triggers, releasing chemicals that cause blood vessels to swell and dilate. Pain receptors surrounding these vessels, transmit pain signals to the higher centres of the brain, and create the first sensation of pulsating headache pain.
![](https://i.ytimg.com/vi/9iP3MaiaMsg/maxresdefault.jpg)