infection of the central nervous system (cns) can cause hypoventilation or
Central nervous system disease Encephalitis is an inflammation of the brain. It is usually caused by a foreign substance or a viral infection. Symptoms of this disease include headache, neck pain, drowsiness, nausea, and fever. If caused by the West Nile virus,[28] it may be lethal to humans, as well as birds and horses.
Cerebrospinal fluid CSF returns to the vascular system by entering the dural venous sinuses via arachnoid granulations.[2] These are outpouchings of the arachnoid mater into the venous sinuses around the brain, with valves to ensure one-way drainage.[2] This occurs because of a pressure difference between the arachnoid mater and venous sinuses.[3] CSF has also been seen to drain into lymphatic vessels,[17] particularly those surrounding the nose via drainage along the olfactory nerve through the cribriform plate. The pathway and extent are currently not known,[1] but may involve CSF flow along some cranial nerves and be more prominent in the neonate.[3] CSF turns over at a rate of three to four times a day.[2] CSF has also been seen to be reabsorbed through the sheathes of cranial and spinal nerve sheathes, and through the ependyma.[3]