1. Introduction and Scope.- 2. The Ancestral Middle Ear.- 3. Hearing Organ and Skull.- 4. Volume of the Middle Ear Cavity.- 5. Tympanic Membrane and Tympanic Plate.- 6. Malleus-Incus Complex.- 7. Stapes Complex.- 8. Middle Ear Muscles and Articulations.- 9. Audiogram and Middle Ear Construction.- 10. Summary.- References.