In a case involving tonsil stones (tonsilloliths) visualized in the oropharynx, which muscle forms the anterior tonsillar pillar (commonly pointed to in an image of this region)?

The palatoglossus muscle forms the anterior tonsillar pillar (the anterior faucial arch), visible as a fold of tissue anterior to the palatine tonsil in the oropharynx, while the palatopharyngeus muscle forms the posterior tonsillar pillar (posterior faucial arch) just behind the tonsil.