Fig. 4From: In vivo endoscopic study of the variations of anatomical structures in the hidden spaces of the middle ear during endoscopic ear surgery30º endoscopic view of Rt. ear retrotympanum: Ponticulus (blue arrow) and subiculum (white arrow) of type A, footplate (FP), facial nerve (FN), pyramid (P), posterior sinus (PS): pyramid PO, ponticulus, ST: sinus tympani (ST), sinus subtympanicus (SST) and oblique fustis (star)Back to article page