Bulbar palsy
| Bulbar palsy | |
|---|---|
| Classification and external resources | |
| Specialty | neurology |
| ICD-10 | G12.2 |
| ICD-9-CM | 335.22 |
| OMIM | 211530 |
| DiseasesDB | 16043 |
| MeSH | D010244 |
Bulbar palsy refers to impairment of function of the cranial nerves IX, X, XI and XII, which occurs due to a lower motor neuron lesion either at nuclear or fascicular level in the medulla oblongata or from lesions of the lower cranial nerves outside the brainstem.
In contrast, pseudobulbar palsy describes impairment of function of cranial nerves IX-XII due to upper motor neuron lesions of the corticobulbar tracts in the mid-pons. For clinically evident dysfunction to occur, such lesions must be bilateral as these cranial nerve nuclei receive bilateral innervation.
Bulbar palsy is an assortment of signs and symptoms, not the name of a precise disease.
These include:
These include:
The ocular muscles are spared and this differentiates it from myasthenia gravis.
Pseudobulbar palsy is a clinical syndrome similar to bulbar palsy but the damage is located in upper motor neurons, that is the nerve cells coming down from the cerebral cortex innervating the motor nuclei in the medulla. This is usually caused by stroke.
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