Which of the following structuers is inferior to spheno petrosal Synchondrosis-: (A) Abducens nerve, (B) Osseous pa of auditory tube, (C) Cailaginus pa of auditory tube, (D) Petro squamous sinus
Answer is C. Sphenopetrosal synchondrosis is cailagenous union b/w lateral half margin of great wing of sphenoid & petrous bone. On the under surface of sphenopetrosal synchondrosis, is a furrow, the sulcus of auditory tube for lodgement of cailagenous pa of auditory tubeQ