Finger-nose inaccuracy means that the patient is asked to extend the arm and touch the fingertip of the examiner’s finger, and then point to the tip of his or her own nose, and repeat the comparison several times with different directions, speeds, and eyes open and closed. In the case of cerebellar lesions, the nasal finger is not accurate, the movement becomes slower when approaching the tip of the nose, the distance cannot be adjusted correctly, the distance is over-measured (poor distance discrimination) or there is motor tremor. The degree of nasal inaccuracy is parallel to the degree of lesion. What are the main tests for nasal inaccuracy? Cerebral nerve examination There are 12 pairs of cerebral nerves, which are generally named sequentially with Roman numerals. The first and second pairs (olfactory and optic) of cerebral nerves are the bundles of nerve fibers of their secondary and tertiary neurons in the intracranial part, while the remaining 10 pairs of cerebral nerves are connected to the brainstem, which has its nuclei. A portion of the Ⅺ pair of cerebral nerves (paranerves) emanates from the anterior horn of the upper segments of the cervical spinal cord. The cerebral nerves have sensory and motor fibers and mainly innervate the head and face. The I, II, and VIII pairs are sensory nerves, the III, IV, VI, D, and Ⅻ pairs are motor nerves, and the V, VII, IX, and X pairs are mixed nerves. In addition, pairs III, VII, IX, and X contain parasympathetic nerve fibers. All supranuclear innervation of the motor nuclei of the cerebral nerves are doubly innervated, except for two pairs (the lower part of the nuclei of the VII and Ⅻ pairs). Cerebral nerve examination is extremely meaningful for the localization and diagnosis of cranial damage. There are 12 pairs of cerebral nerves, and the examination of cerebral nerves should be performed in sequential order to avoid duplication and omission. Neurological examination The neurological examination is to determine the presence or absence of neurological damage and the location and extent of the damage, i.e., to solve the “localization” diagnosis of the lesion. The examination should be performed in a certain order and in conjunction with the general physical examination. Usually, the cranial nerves are examined first, including their motor, sensory, reflex and vegetative functions; then the motor system and reflexes of the upper and lower extremities are examined sequentially, and finally the sensory and vegetative nervous systems are examined. The examination should also be focused according to the history and initial observations, especially in the examination of critically injured patients, which is more important. In addition, cortical dysfunction such as consciousness, aphasia, loss of use, and loss of recognition also belong to the scope of neurological examination.