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