Unknown Retro pharyngeal space extends up to which of the following level? A Base of skull to C6 vertebra B Base of skull to bifurcation of trachea C Base of skull to the level of diaphragm D Base of skull to cricoid cartilage 💡 Explanation Retro pharyngeal space extends up to which of the following level? ✓ Correct Answer: B. Base of skull to bifurcation of trachea