There are 12 paired cranial nerves, numbered in Roman numerals from the most rostral (in the forebrain) to the most caudal (in the lower brain stem). The nerves are named for their particular functions (the "oculomotor" nerves move the eyes) or for some other notable property ("trigeminal," meaning "three twins," is the name given to the fifth cranial nerve; "vagus," meaning "wanderer," is the name for the 10th cranial nerve).
Some of the cranial nerves are motor, some are sensory, and some are mixed (Table II).
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Whenever a doctor informs the parents that their child is suffering with Autism, the first & foremost question that is thrown over him is - How did it happen? How did my child get this disease? Well, there is no definite answer to what are the exact causes of Autism.