Anatomical illustration of the human ear with numbered labels for educational purposes.

Let me carefully examine the image to identify each labeled part of the ear using the provided word bank.

First, I’ll locate each numbered label (1–12) on the diagram and match it with the correct term from the list:

Word bank:
- Pinna
- Ear drum
- Ear canal
- Malleus
- Incus
- Stapes
- Auditory nerve
- Cochlea
- Semicircular canals
- Eustachian tube
- Tympanum cavity
- Round window

Now I’ll go one by one:

1. The outer visible part of the ear — that’s the Pinna.
2. The tube leading from the outside into the middle ear — that’s the Ear canal.
3. The thin membrane at the end of the ear canal — that’s the Ear drum (also called tympanic membrane).
4. The air-filled space behind the eardrum — that’s the Tympanum cavity (also called middle ear cavity).
5. The first tiny bone in the middle ear, attached to the eardrum — that’s the Malleus.
6. The second bone, connected to the malleus — that’s the Incus.
7. The third and smallest bone, connecting incus to inner ear — that’s the Stapes.
8. The spiral-shaped organ in the inner ear — that’s the Cochlea.
9. The three looped tubes above the cochlea — those are the Semicircular canals.
10. The opening at the base of the cochlea — that’s the Round window.
11. The tube connecting the middle ear to the throat — that’s the Eustachian tube.
12. The nerve carrying sound signals to the brain — that’s the Auditory nerve.

Let me double-check using zoom-in for accuracy on tricky ones (e.g., 10 vs 12, 11 placement).

I’ll now verify label 11 and 12:
- Label 11 points to the tube going downward from the middle ear — definitely Eustachian tube.
- Label 12 points to the nerve bundle exiting the cochlea — Auditory nerve.

All matches are consistent.

Final Answer:
1. Pinna
2. Ear canal
3. Ear drum
4. Tympanum cavity
5. Malleus
6. Incus
7. Stapes
8. Cochlea
9. Semicircular canals
10. Round window
11. Eustachian tube
12. Auditory nerve