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Neuro II-CN XI & XII

Thomadaki Fall 2010

QuestionAnswer
What is the nucleus of CN XI? Nucleus ambiguus and disperse cell bodies/ medulla & cervical segments
Where does CN XI exit? post olivary sulcus
What are the branches of CN XI? Splits into a cranial and spinal root
What is the cranial accessory function of CN XI? Joins the vagus nerve to supply the muscles of the pharynx, larynx and soft palate
What is the spinal accessory function of CN XI? Motor to the SCM & trap muscles
What are the symptoms of a lesion to CN XI? Inability to rotate head & shrug shoulder
Where do CN IX, X & XI exit? Jugular foramen
What is the nucleus of CN XII? Hypoglossal nucleus at the level of the medulla
WHere does CN XII exit? Pre-olivary sulcus
What is the function of CN XII? Motor to all of the tongue muscles (muscles that end with glossus) except palatoglossus which is supplied by the vagus like all palatine muscles.
What are the symptoms of of a lesion to CN XII? Ipsilateral tongue paralysis & atrophy
Where does CN XII exit from the skull? Hypoglossal canal
Why are supranuclear (UMN) symptoms of CN rare? Because the corticobulbar tract innervates most of them bilaterally.
Created by: mrw2013