<prompt> Ipsilateral deviation of tongue in 12th nerve palsy is due to -Unaltered action of ipsilateral genioglossusUnaltered action of contralateral genioglossusAction of hyoglossusAction of lateral pterygoid  <response>: Injury to hypoglossal 12th nerve paralyzes ipsilateral half of the tongue. When the tongue is protruded, its tip deviates towards the paralyzed side because of unopposed action of genioglossus muscle on the normal side of the tongue. 