Check the cranial nerves. For what?

The examination of the cranial nerves is mainly a physical examination of the nervous system: the first, such as the examination of the optic nerve, is mainly to check the patient's vision; the second, the examination of the olfactory nerve, mainly with a test tube containing a non-irritating liquid, let the patient smell the smell to check the patient's olfactory nerve; The third, oculomotor pulley and abducent nerve, mainly through the examination of the patient's eyeball activity, to check whether the patient's eyes are involved, eyeball activity has no obstacles, there is no diplopia; the fourth, check the facial nerve can let the patient open his mouth to check whether the facial lines on both sides are symmetrical; the fifth, check the hypoglossal nerve, can let the patient stretch his tongue to understand whether there is deviation of tongue extension; Sixth, when examining the accessory nerve, the patient could shrug or turn his head to understand whether the patient's accessory nerve was involved; seventh, the glossopharyngeal vagus nerve, mainly to let the patient speak to see if the patient had a unclear word, or drink water to check if there was a cough. Therefore, the general examination of the cranial nerve was mainly a specialized examination of the nervous system.