MIDDLE EAR is an air filled cavity connected to the back of the Nose by a long , thin tube called Eustachian Tube. The middle ear space three Bones , The HAMMER , ANVIL and STAPES. The outer wall of the middle ear is the TYMPANIC MEMBRANE , inner wall is the COCHLEA .TYMPANIC MEMBRANE The External Auditory Meatus ends at the TM or ear drum , which amgled at 55 degree to the canal . The ear drum is smooth , Traslucent and sometimes almost transparent membrane with average Thickness of only about 0.074 mm . It is slightly taller (about 0.9 to 1.0 cm ) , than it is wide about 0.8 to 0.9 cm .The TM is connected to the Mallecus , which is the first part of the middle ear bones.
