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Cranial Nerves
 
Cranial Nerves
 

CN XI: Accessory Nerve

 
 
 
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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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