Medical Definition of Tractus corticobulbaris

1. Collective term for those fibres (corticonuclear fibres) which separate from the corticospinal tract in the course of the latter's descent through the pons and medulla oblongata. Fibres of this tract innervate the motor nuclei of the trigeminal, facial, and hypoglossal nerves (perhaps also the nucleus ambiguus), directly and by way of interneurons in the lateral part of the rhombencephalic tegmentum. No direct supranuclear cortical innervation of the motor nuclei innervating the external eye muscles (oculomotor, trochlear, abducens) has been identified. Fibres of the corticobulbar tract also project into the formatio reticularis (i.e., corticoreticular fibres) and terminate upon sensory relay nuclei (e.g., gracile and cuneate nuclei, nucleus spinalis trigeminalis and nucleus solitarius). Synonym: tractus corticobulbaris. (05 Mar 2000)



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Lexicographical Neighbors of Tractus Corticobulbaris

tractorless
tractorlike
tractors
tractors out
tractory
tractotomy
tractrices
tractricoid
tractricoids
tractrix
tracts
tractus
tractus cerebellorubralis
tractus cerebellothalamicus
tractus corticobulbaris (current term)
tractus corticopontini
tractus corticospinalis
tractus corticospinalis anterior
tractus corticospinalis lateralis
tractus descendens nervi trigemini
tractus dorsolateralis
tractus fastigiobulbaris
tractus habenulopeduncularis
tractus iliotibialis
tractus mesencephalicus nervi trigemini
tractus occipitopontinus
tractus olfactorius
tractus olivocerebellaris

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