Hypoglossal Nerve Disorders
(See also Overview of the Cranial Nerves.)
Disorders of the 12th cranial nerve (hypoglossal nerve) cause weakness or wasting (atrophy) of the tongue on the affected side. This nerve moves the tongue.
Causes of hypoglossal nerve disorders include
Magnetic resonance imaging (MRI) is usually done to look for a tumor or evidence of a stroke.
A spinal tap (lumbar puncture) may be necessary if cancer or infection is possible.