51. External auditory meatus develops from___________________? September 27, 2025 by Admin A. Dorsal part of 1st ectodermal pouch B. Dorsal part of 2nd cleft C. Dorsal part of 3rd ectodermal pouch D. Sixth branchial arch ✅ The correct answer is option A. Dorsal part of 1st ectodermal pouch.