Which muscle is innervated by the XII hypoglossal nerve?
The hypoglossal nerve (CN XII) is exclusively a motor nerve carrying general somatic efferent fibers (GSE). It innervates all intrinsic and almost all extrinsic muscles of the tongue, as well as one suprahyoid muscle, the geniohyoid muscle.
What is the name of cranial nerve XII?
The Hypoglossal Nerve
The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII). It is mainly an efferent nerve for the tongue musculature. The nerve originates from the medulla and travels caudally and dorsally to the tongue.
What Innervates the tongue?
All the muscles of the tongue are innervated by the hypoglossal nerve (CN XII), except for the palatoglossus muscle which is supplied by the vagus nerve (CN X).
Where is the 12th cranial nerve?
The hypoglossal nerve is one of 12 cranial nerves. It’s also known as the 12th cranial nerve, cranial nerve 12 or CNXII. This nerve starts at the base of your brain. It travels down your neck and branches out, ending at the base and underside of your tongue.
What happens when left hypoglossal nerve is damaged?
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. The tongue is first observed for position and appearance while it is at rest.
What causes nerve pain in tongue?
Glossopharyngeal neuralgia is characterized by a sharp, jabbing pain deep in the throat, or in the tongue, ear, and tonsils, lasting a few seconds to a few minutes. Glossopharyngeal neuralgia is generally caused by a small blood vessel that presses on the nerves as they exit the brainstem.
What causes nerve damage to the tongue?
Damage to the lingual nerve occurs most commonly when removing a wisdom tooth, also known as the third molar, in the lower jaw. This can lead to a feeling of numbness, a prickling sensation, and sometimes a change in how food or drink tastes. It may only affect one side of the tongue, or extend to the lips and chin.
How do you test for cranial nerve 12?
The 12th CN is tested by having the patient stick out their tongue and move it side to side. Further strength testing can be done by having the patient push the tongue against a tongue blade. Inspect the tongue for atrophy and fasciculations.