Glossoplegia, or paralysis of the tongue, is uncommon. Causes in horses include incorrect placement of obstetric snares in neonates during manual forced extraction (delivery), upper respiratory tract infections including strangles, meningitis, botulism, encephalomyelitis, leukoencephalomalacia, equine protozoal encephalomyelitis, and cerebral abscessation. Any condition that damages the hypoglossal nerve (cranial nerve XII), which is the major motor nerve to the muscles of the tongue, can result in glossoplegia.
Neonates with glossoplegia must be monitored carefully to ensure they are able to eat. If necessary, a nasogastric tube should be placed in affected foals for supplemental feeding including administration of colostrum, or intravenous plasma should be administered to prevent failure of passive transfer. Foals unable to maintain hydration may require intravenous fluid therapy and anti-inflammatory medication (eg, phenylbutazone, flunixin meglumine, or dexamethasone). Prophylaxis against gastric ulceration is also indicated. If the condition persists for >10 days after birth, the prognosis for regaining normal function is guarded.
Inflammatory diseases and trauma may also result in transient glossoplegia. Occasionally, horses undergoing prolonged dental procedures involving excessive traction on the tongue can develop temporary glossoplegia. The prognosis of glossoplegia depends on the horse’s response to treatment for the primary condition.
In cattle, glossoplegia may accompany severe actinobacillosis. There may be complete paralysis of the tongue accompanied by necrosis of the tip. Such conditions occasionally occur in outbreaks in feedlot cattle and may follow a bout of viral stomatitis.
