What is the function of three tiny bones in the ear?

Name the three tiny bones present in the middle part of ear.

There are three small bones in the middle ear—anvil, hammer and stirrup:

(a) Which of these bones is in touch with ear-drum?

(b) Which of these bones is in touch with oval window?

Name the tube which connects the middle ear to throat.

Name the nerve which carries electrical impulses from the cochlea of ear to the brain.