placode

The inner ear, which mediates hearing and equilibrium, develops from an ectodermal placode located adjacent to the developing hindbrain.

And then, moving the evaporating plating fountain to the evaporating plating room, which can plates the evaporating plating fountain onto the placode by the film forming divece.

Reptiles have placodes too. But in a reptile embryo each placode switches on genes that cause only the skin cells on the back edge of the placode to grow, eventually forming scales.