This wave information travels across the air-filled middle ear cavity via a series of delicate bones : the malleus -LRB- hammer -RRB- , incus -LRB- anvil -RRB- and stapes -LRB- stirrup -RRB- .

The malleus -LRB- hammer -RRB- , incus -LRB- anvil -RRB- and stapes -LRB- stirrup -RRB- .
