Trapezoid body Trigeminal lemniscus Dorsal trigeminal tract Ventral trigeminal tract Medial lemniscus Lateral lemniscus Medial longitudinal fasciculus Vestibulo-oculomotor fibers Anterior trigeminothalamic tract Central tegmental tract. Celiac Renal Hepatic Anterior gastric Posterior gastric. Views Read Contralateral View history. The inferior four branches do so via the left and right anterior components. Whereas at a level above the medulla a lesion occurring in one hemisphere would mean that the nerve hemisphere could still sufficiently innervate the posterior facial motor nucleus, a lesion affecting a lower motor neuron would eliminate innervation altogether because the nerves no longer facial nerve contralateral a means to receive compensatory facial input at a downstream decussation.
Nuclei anterior olfactory nucleus Course olfactory bulb olfactory tract. Branches of the facial nerve leaving the facial motor nucleus FMN for the muscles do so via both left and right posterior dorsal and anterior ventral routes. The posterior component, however, although now only receiving input from the right hemisphere, is still able to allow the temporal branch to sufficiently innervate the entire forehead.
The nucleus has a dorsal and ventral region, with neurons in the dorsal region innervating muscles of the upper face and neurons in the ventral region innervating muscles of the lower face. Apneustic center Pneumotaxic center Parabrachial nuclei Subparabrachial nucleus Medial parabrachial nucleus Lateral parabrachial nucleus Superior olivary nucleus Locus coeruleus.
Otherwise it is described by its cause. The temporal branch travels out from the left and right posterior components. Inferior cerebellar peduncle Vestibulocerebellar tract Medial longitudinal fasciculus Vestibulospinal tract Medial vestibulospinal tract Lateral vestibulospinal tract.
Upper motor neurons of the cortex send axons that descend through the internal capsule and synapse on neurons in the facial motor nucleus. If a cause, such as trauma or infection, cannot be identified this situation is called idiopathic palsy this condition is known as Bell's palsy. Brain and spinal cord: