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Cranial Nerves
 
 

CN XII: Hypoglossal Nerve

 
 
 
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On this page:Hypoglossal Nerve PalsyMotor Pathway
 View Topic Outline

Overview

    • Role

    • Somatic motor - intrinsic and extrinsic tongue muscles.

Hypoglossal Nerve Palsy

    • Abnormalities

    • Tongue atrophy
    • Fasciculations (nuclear lesion)
    • Diversion of tongue toward lesion
    • Inability to point tongue away from the side of lesion

    • Causes of Hypoglossal Nerve Palsy

    • Tumour
    • Trauma
    • Infarction
    • Haemorrhage
    • Demyelination
    • Motor neurone disease

Motor Pathway

  • Cortical Centre
    Primary motor cortex (precentral gyrus)
     
     
    Hypoglossal Nucleus
    Medulla
     
    Foramen
    Hypoglossal canal
     
     
    Muscles
    Intrinsic & extrinsic tongue muscles
 
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