<prompt> Which of the following cranial structures are insensitive to pain:Dural sheath surrounding vascular sinusesChoroid PlexusFalx cerebriMiddle meningeal Aery  <response>: Answer is B Choroid plexus: Choroid plexus is a pain insensitive cranial structure. The ventricular ependyma, choroids plexus, pial veins and much of brain parenchyma are not pain producing- Harrisons Pain Sensitive Intracranial Cranial venous sinuses with afferent veins Aeries at base of brain and aeries of dura including middle meningeal aery Dura around venous sinuses and vessels Falx Cerebri Extracranial Skin Scalp Appendages Periostium Muscles Aeries Mucosa Nerves Trigeminal Vth Facial VIII Vagal X GlossopharyngealIX Second II Third IIIrd C.N. Pain Insensitive Intracranial Brain parenchyma Ependyma Choroid plexus Piamater Arachnoid Dura over convexity of skull Dura around vascular sinuses and vessels is sensitive to pain 