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genioglossus
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Inactivity of the genioglossus during sleep or under general anesthetic can allow the tongue to fall backward and obstruct the pharynx, causing respiratory distress.

Cancer of the tongue has the potential to metastasize through lymphatic drainage of the tongue. Lymph from any region near the midline of the tongue and the lower lip can drain bilaterally. Lymph from the tip of the tongue drains to both the submental nodes and jugulo-omohyoid nodes bilaterally this lymph can then travel to the > jugulodigastric nodes > (inferior) deep cervical nodes > jugular trunk.
As a result, paramedian cancers of lip and tongue are far more serious than lateral cancers (which typically drain unilaterally) because it can spread to deep cervical nodes on both sides.
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