Tympanic membrane embryology

The external auditory canal is separated from the tympanic cavity by the tympanic membrane, which has an inner layer of endoderm, a middle layer of mesoderm, and an outer layer of ectoderm. The tympanic cavity has expanded around the ossicles. The membranous labyrinth is contained within the bony labyrinth. The perilympathic fluid that conducts sound to the cochlea communicates acoustic energy through the oval and round windows.