Interactive diagram of ear anatomy with drag-and-drop labels.

The image provided is a diagram of the parts of the ear, and the task is to label the different structures. Below is the solution with explanations for each part:

Diagram Labels:

1. Pinna (Auricle)
- The pinna is the visible part of the outer ear that collects sound waves and directs them into the ear canal.

2. Ear Canal (External Auditory Meatus)
- The ear canal is a tube that connects the pinna to the eardrum. It helps conduct sound waves from the outer ear to the middle ear.

3. Eardrum (Tympanic Membrane)
- The eardrum is a thin, flexible membrane that vibrates in response to sound waves. These vibrations are transmitted to the bones of the middle ear.

4. Cochlea
- The cochlea is a spiral-shaped structure in the inner ear. It contains fluid and hair cells that convert vibrations into electrical signals, which are then sent to the brain via the auditory nerve.

5. Semicircular Canals
- The semicircular canals are part of the vestibular system in the inner ear. They help maintain balance by detecting head movements.

6. Malleus (Hammer)
- The malleus is one of the three tiny bones (ossicles) in the middle ear. It is attached to the eardrum and transmits vibrations to the incus.

7. Incus (Anvil)
- The incus is the second ossicle in the middle ear. It connects the malleus to the stapes and helps transmit vibrations.

8. Stapes (Stirrup)
- The stapes is the third ossicle in the middle ear. It transmits vibrations from the incus to the oval window, which leads to the inner ear.

9. Oval Window
- The oval window is a membrane-covered opening that separates the middle ear from the inner ear. Vibrations from the stapes are transmitted through this window into the cochlea.

Final Labeling:

- 1: Pinna (Auricle)
- 2: Ear Canal (External Auditory Meatus)
- 3: Eardrum (Tympanic Membrane)
- 4: Cochlea
- 5: Semicircular Canals
- 6: Malleus (Hammer)
- 7: Incus (Anvil)
- 8: Stapes (Stirrup)
- 9: Oval Window

Explanation of Ear Function:

The ear is divided into three main parts: the outer ear, middle ear, and inner ear. Each part plays a crucial role in hearing and maintaining balance:
1. Outer Ear: Collects sound waves and directs them into the ear canal.
2. Middle Ear: Amplifies sound vibrations using the ossicles (malleus, incus, and stapes).
3. Inner Ear: Converts vibrations into electrical signals and sends them to the brain via the auditory nerve. It also contains structures for balance (semicircular canals).

This labeling exercise helps understand the anatomy and function of the ear in detail.

Final Answer:
\boxed{
\begin{aligned}
1 & : \text{Pinna (Auricle)} \\
2 & : \text{Ear Canal (External Auditory Meatus)} \\
3 & : \text{Eardrum (Tympanic Membrane)} \\
4 & : \text{Cochlea} \\
5 & : \text{Semicircular Canals} \\
6 & : \text{Malleus (Hammer)} \\
7 & : \text{Incus (Anvil)} \\
8 & : \text{Stapes (Stirrup)} \\
9 & : \text{Oval Window}
\end{aligned}
}