When the tongue is extended, the tip of the tongue is tilted to one side, either left or right, which is called tongue distortion. When the tongue muscle on the sick side is paralyzed, it is unable to contract, and when it is slightly extended, the tongue body is unevenly skewed on both sides, so the tip of the tongue is to the left when the left tongue muscle is paralyzed, and to the right when the right tongue muscle is paralyzed. This condition is commonly associated with stroke, i.e. cerebrovascular accident. The facial nerve and hypoglossal nerve, which govern the lower facial muscles, are damaged. The lingual nerve is connected to the brain and the tongue is the prior organ of the brain. A stiff and crooked tongue is mostly a precursor to problems such as stroke and facial paralysis. And high blood pressure, diabetes, hyperlipidemia, obesity, and smoking are all important factors that lead to stroke. What tests are needed for tongue palsy? Cranial CT Cranial CT is a method of examining the cranial brain through CT. Cranial CT is a new examination method that is convenient, rapid, safe, painless and non-invasive. It can clearly show the anatomical relationship between different cross-sections of the skull and the specific brain tissue structure. Thus, it greatly improves the detection rate of lesions and the accuracy of diagnosis. In general, CT has better visualization of human hard tissues than soft tissues. Cranial CT examination is important for the diagnosis of most diseases of the intracranial, cranial, and scalp (including trauma, tumors, inflammation, vascular lesions, poisoning, degenerative and metabolic diseases, etc.). Nuclear Magnetic Resonance Imaging Nuclear Magnetic Resonance Imaging (NMRI), also known as spin imaging, also known as Magnetic Resonance Imaging (MRI), also known as magnetic resonance imaging in Taiwan, also known as magnetic resonance imaging in Hong Kong MRI, also known as Magnetic Resonance Imaging (MRI) in Taiwan and Magnetic Resonance Imaging (MRI) in Hong Kong, is the use of the principle of nuclear magnetic resonance (NMR), which is based on the different attenuation of the energy released in different structural environments within a material, and the location and type of atomic nuclei that make up the object can be detected by applying a gradient magnetic field, which can be used to map the internal structure of the object. Sublingual nerve examination The sublingual nerve examination innervates the ipsilateral tongue muscle and serves to extend the tongue forward and push it to the opposite side. The patient is asked to extend the tongue and observe for tongue deviation, unequal thickness and fluttering on both sides of the tongue edge. During the examination, observe the position and shape of the tongue in the mouth, then ask the patient to extend the tongue, observe whether there is deflection, muscle atrophy and muscle bundle fluttering, and movement to the left and right sides respectively, and finally hold the doctor’s finger through the cheek to compare the muscle strength on both sides. No food should be present in the mouth during the examination.