F. External and Middle Ear Structures Choose the structure that applies to each statement. More than one structure may apply to a statement, and a structure may be used more than once. a. auditory tube h. malleus b. auricle i. middle ear c. external auditory canal j. oval window d. extemal ear k. stapes e. helix 1. tympanic membrane f. incus g. lobule 1. auditory ossicle attached to tympanic membrane 2. equalizes air pressure in middle ear with external air pressure 3. extemal ear structures 4. ear drum 5. external feature of ear that contains the helix and lobule 6. stapes is attached to this membrane-covered opening 7. middle auditory ossicle 8. small bones of middle ear that are connected by synovial joints .