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
MedullaForamen
Jugular foramenDivision
Cranial and spinal branchesMuscles
Laryngeal & pharyngeal, sternocleidomastoid, trapezius
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------