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Kaplan Qbank USMLE



Author3 Posts
  #1

A facial nerve lesion (bells palsy)will result in complete paralysis on the ipsilateral side but corticobulbar lesion will result in only drooping of corner of mouth .can neone explain y only the lower facial muscles r involved only in corticobulbar lesion.

  #2

cranial nerve nuclei receives umn's bilaterally from both the cortices ,except for facial nerve nuclei [innervating lower half of the face] which receives only from contralateral side.

because of the bilateral innervation ,lesions involving corticobulbar tract will not affect any of the cranial nerves except for those facial nerve nuclei tht is innervating lower half of the face! {on the contralateral side}


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  #3

thanks ssrpk thats a gr8 explanation......smiling face







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