Mechanical stimulation of the pain sensitive structures of the brain can cause headache. All of the following are the pain sensitive structures of brain, EXCEPT?

Pain sensitive structures of the brain are,Middle meningeal aeryDural sinusesFalx cerebriProximal segments of the large pial aeriesVentricular ependyma, choroid plexus, pial veins, and much of the brain parenchyma are insensitive to the pain.