<prompt> 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:Falx cerebriDural sheath surrounding vascular sinusesMiddle meningeal aeryChoroid plexus  <response>: 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. Ref: Merritts Neurology By Lewis P. Rowland, Timothy Asbury Pedley, Hiram Houston Merritt, 2010, Page 710. 