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 · The exact function of the paranasal sinuses is not well understood The possible roles of the sinuses may include reducing the weight of the skull · Sphenoid bone function Sphenoid bone is called the keystone of the cranial floor because it articulates with all the other cranial bones, holding them together The function of the skull is both structurally supportive and protective 2) It protects its inner contents the cerebrum, cerebellum, brainstem, and orbits · Dural venous sinuses The human brain has the highest demand for oxygen of any tissue in the human body It receives a vast amount of blood from two systems the internal carotid system anteriorly, and the vertebrobasilar system posteriorly However, there is very little space in the cranial vault to accommodate large amounts of blood Paranasal Sinuses Complete Anatomy Why do we have sinuses in your skull