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
MedullaForamen
Hypoglossal canalMuscles
Intrinsic & extrinsic tongue muscles
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