From which embryonic layer does the inner ear develop?

The inner ear develops from the ectoderm, which is one of the three primary germ layers formed during embryogenesis. Specifically, the inner ear originates from a structure called the otic placode, which is a thickening of the ectoderm. This placode eventually invaginates and gives rise to the various components of the inner ear, including the cochlea, vestibule, and semicircular canals.

The mesoderm and endoderm contribute to other structures in the body, such as the muscles, bones, cardiovascular system, and gastrointestinal tract, but they do not play a direct role in the formation of the inner ear. Therefore, it is accurate to state that the inner ear arises exclusively from the ectoderm layer during development.