Fig. 1From: In vivo endoscopic study of the variations of anatomical structures in the hidden spaces of the middle ear during endoscopic ear surgery0º endoscopic view of Lt. middle ear. Posterior sinus (PS), pyramidal eminence (P), sinus tympani (ST), styloid eminence (S), sinus subtympanicus (SST), finiculus (blue arrow), hypotympanum (HY), protinuculum (yellow arrow), protympanum (PR) and annular groove (A)Back to article page