Correct Option
The correct option is Stapes.
Explanation
The middle ear contains three distinct, tiny bones collectively known as the auditory ossicles. These bones are responsible for transmitting sound vibrations from the tympanic membrane (eardrum) to the oval window of the inner ear. They are named according to their shapes: Malleus (hammer), Incus (anvil), and Stapes (stirrup).
Option Analysis
- Stapes is correct: The Stapes is the third of the auditory ossicles. It is stirrup-shaped and is attached to the oval window of the cochlea. It is notable for being the smallest bone in the human body.
- Calcaneus is incorrect: The Calcaneus is the heel bone, which is the largest of the tarsal bones located in the foot.
- Scaphoid is incorrect: The Scaphoid is one of the carpal bones located in the wrist.
- Patella is incorrect: The Patella, commonly known as the kneecap, is a sesamoid bone embedded within the tendon of the quadriceps muscle in the leg.
Key Takeaway: The three auditory ossicles in the middle ear are the Malleus, Incus, and Stapes. Their primary function is to amplify and transmit sound waves to the inner ear.