Final answer:
The skeletal structures that arise from arch 3 are the bones of the middle ear - the malleus, incus, and stapes.
Step-by-step explanation:
The skeletal structures that arise from arch 3 are the bones of the middle ear - the malleus, incus, and stapes. These bones play a crucial role in transmitting sound vibrations from the eardrum to the inner ear. They form part of the auditory ossicles, a chain of tiny bones that amplify and transmit sound waves.