The distance between tympanic membrane and medial wall of middle ear at centre is:
Middle ear cavity is shaped like a cube, compressed from side to side. In coronal section it resembles a biconcave disc. The veical and anteroposterior diameters are 15 mm each, and transverse diameters are: 6 mm (at roof), 2 mm (in the centre). 4 mm (at floor)
3 mm
4 mm
6 mm
2 mm
Eye, Nose and Ear