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Cranial Nerves
 
 

CN XI: Accessory Nerve

 
 
 
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On this page:Accessory Nerve PalsyMotor Pathway
 View Topic Outline

Overview

    • Role

    • Motor - laryngeal & pharyngeal muscles, sternocleidomastoid, trapezius

Accessory Nerve Palsy

    • Abnormalities

    • Shoulder drop
    • Inability to turn head to contralateral side

    • Causes of Accessory Nerve Palsy

    • Trauma - blunt, cervical stretch injury, iatrogenic (e.g. lymph node biopsy)
    • Tumour
    • Medullary infarction

Motor Pathway

  • Cortical Centre
    Primary motor cortex (precentral gyrus)
     
     
    Accessory Nucleus
    Medulla
     
    Foramen
    Jugular foramen
     
    Division
    Cranial and spinal branches
     
     
    Muscles
    Laryngeal & pharyngeal, sternocleidomastoid, trapezius
 
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