Tongue deflection (paralysis of the lower cord [CNXII]): signs of symptoms and causes
The tongue will be deflected to the affected side. The chin tongue muscle is under the influence of the paralysis nerve and moves the tongue to the middle and forward.
Tongue deflects towards the affected side.
Post-treatment (eg complications after carotid endothelial surgery).
Mass lesions (eg. Tumor, abscess).
Carotid artery surgery
Figure. Paralysis of the left paralysis nerve with the tongue deflecting to the affected side
The chin tongue muscle is under the influence of the paralysis nerve and moves the tongue to the middle and forward. Normally, the force of the chin and tongue muscles is balanced and the tongue will be kept straight in the middle. If the chin and tongue muscles are weak, the tongue will be deflected to the injured side, because of the loss of pulling force on the injured side.
Causes of blade deflection:
Lower cord paralysis.
Median medullary syndrome.
Lumbar paralysis (CNXII)
Paralysis is often accompanied by symptoms of other cranial nerves. Causes include sublingual stenosis, internal carotid aneurysm, surgery for the inner carotid artery, after endothelial treatment, and trauma to the neck.
Median medullary syndrome
Spinal and/or anterior dendritic infarction can damage the bundle of the pyramid, the posterior bundle of the posterior branches and branches, and the hypoglossal cord. The result is a weakness in the maxilla of the chin, weakness in the arms and legs of the opposite side, and decreased sensation of vibration, lateral movement.
The hypoglossal nerve is the most common cause of tongue deflection. The tongue will be deflected to the affected side.