corticobulbar tract
The corticobulbar (or corticonuclear) tract originates primarily in Brodmann area 4 and exits at the brainstem to synapse on the lower motor neurons of the cranial nerves bilaterally. The exception to this is the facial nerve and hypoglossal nerve.
Innervation to the lower half of the face (via the facial nerve) and the tongue (via the hypoglossal nerve) is only contralateral.
It is involved in the movement of the face, head and neck .
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