Which side will the tongue deviate in a lesion of the hypoglossal nerve?

Which side will the tongue deviate in a lesion of the hypoglossal nerve?

If the damage is to the nerve itself (a lower motor neuron lesion), the tongue will curve toward the damaged side, owing to weakness of the genioglossus muscle of affected side which action is to deviate the tongue in the contralateral side .

What will be the effect of right hypoglossal nerve is damaged?

The hypoglossal nerve can be damaged at the hypoglossal nucleus (nuclear), above the hypoglossal nucleus (supranuclear), or interrupted at the motor axons (infranuclear). Such damage causes paralysis, fasciculations (as noted by a scalloped appearance of the tongue), and eventual atrophy of the tongue muscles.

Which side does the tongue deviate to?

weak side
When unilateral weakness is present, the tongue deviates toward the weak side on protrusion because of the action of the normal genioglossus, which protrudes the tongue by drawing the root forward (Video). The tongue always deviates toward the weak side.

What are the signs of lesion of hypoglossal nerve?

Lesions of the hypoglossal nerve

• Paralysis, atrophy and fasciculations of the tongue on the ipsilateral side (with nuclear or infranuclear lesions)
• Mild weakness of the tongue on the contralateral side (with supranuclear lesions)

Why does the tongue deviate to one side?

When the motor cortex in the brain is damaged, the hypoglossal nerve, which is a pure motor nerve innervating the muscles of the tongue, will be defective. Therefore, the tongue will have a tendency to turn away from the midline when extended or protruded, and it will deviate toward the side of the lesion.

Which nerve causes tongue deviation?

The hypoglossal nerve innervates the ipsilateral muscles of the tongue, and its activation causes the protrusion of the tongue.

What does tongue deviation mean?

Therefore, the tongue will have a tendency to turn away from the midline when extended or protruded, and it will deviate toward the side of the lesion. This is called tongue deviation [2-5]. Hence, the symptom of tongue deviation is observed in a stroke or TIA [5-8].

Why does my tongue deviate to the right?

When your patient protrudes her tongue it deviates to the right side which cranial nerve may be affected?

Examination. Damage to the hypoglossal nerve causes paralysis of the tongue. Usually, one side of the tongue is affected, and when the person sticks out his or her tongue, it deviates or points toward the side that is damaged.

What causes tongue deviation?

Does tongue deviate to weak side?

Unilateral tongue weakness causes the tongue to deviate toward the weak side when protruded, as it happens in ipsilateral lesions of tongue muscles and in ipsilateral lesions of lower motor neurons or of the hypoglossal nerve.

Why does uvula deviate away from side of lesion?

The palate elevates more on the left side and the uvula deviates toward the left side because the right side is weak. This patient has a deficit of the right 9th & 10th cranial nerves.