<prompt> Muscle acting for protrusion of tongue is -PalatoglossusGenioglossusStyloglossusHyoglossus  <response>: Ans. is b i.e., Genioglossus MusclesActionExtrinsic PalatoglossusElevates tongue, narrows oropharyngeal isthmus. StyloglossusRetract and elevate the tongue. HyoglossusDepress the tongue, and retract the protruded tongue. GenioglossusProtrude the tongue and deviates it to opposite side.Prevents backward fall of tongue towards oropharynx. It is called safety muscle of tongue or life-saving muscle.Intrinsic Superior longitudinalShortens the tongue makes dorsum concave. Inferior longitudinalShortens the tongue makes dorsum convex. TransverseMakes tongue narrow and elongated. VerticalMakes tongue broad and flattened. 