Corticopontine fibers
 |
| Corticopontine fibers | |
|---|---|
 Coronal section through mid-brain. | |
| Details | |
| Identifiers | |
| Latin | fibrae corticopontinae, tractus corticopontinus |
| NeuroNames | 1322 |
| TA98 | A14.1.05.107 |
| TA2 | 5619 |
| FMA | 75190 |
| Anatomical terms of neuroanatomy | |
Corticopontine fibers, commonly referred to as corticobulbar fibers,[citation needed] are projections from the cerebral cortex to the pontine nuclei.[1]
They are motor fibers that stretch from the precentral gyrus (motor strip) to the nuclei of cranial nerves V (trigenimal), VII (facial) and XII (hypoglossal). These fibers run alongside the corticospinal fibers.
Clinical significance
Several clinical phenomena result from injury to the corticopontine fibers. The corticopontine fibers to cranial nerves V and XII descend to bilateral nuclei. Injury to these fibers result in tongue weakness (cranial nerve XII) and jaw weakness (cranial nerve V) but not full paralysis. The corticopontine fibers to cranial nerve VII descend to innervate bilateral sub-nuclei that supply the forehead but only contralateral to the sub-nuclei that supply the lower face. Injury to these fibers results in paralysis of the lower face, but only weakness of the forehead.
References
- ^ Leergaard TB, Bjaalie JG (2007). "Topography of the complete corticopontine projection: From experiments to principal Maps". Front Neurosci. 1 (1): 211–23. doi:10.3389/neuro.01.1.1.016.2007. PMC 2518056. PMID 18982130.
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External links
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