Surgery The most common site of the internal opening of a branchial fistula is at the – A Lateral nasopharyngeal wall B Fossa of Rosenmuller C Gingivo - labial sulcus D Tonsillar fossa 💡 Explanation The most common site of the internal opening of a branchial fistula is at the - ✓ Correct Answer: D. Tonsillar fossa