Questions: Which muscle's contraction assists with lateral movement of the ear? M. orbicularis oculi M. temporalis Auricular muscles M. masseter

The answer is the third one: Auricular muscles.

Explanation for each option:

1. M. orbicularis oculi: This muscle is responsible for closing the eyelids and is involved in facial expressions, but it does not assist with the movement of the ear.

2. M. temporalis: This muscle is involved in the movement of the jaw, specifically in elevating and retracting the mandible, and does not play a role in ear movement.

3. Auricular muscles: These are a group of muscles that are specifically associated with the movement of the ear. They include the anterior, superior, and posterior auricular muscles, which can move the ear in different directions, including laterally.

4. M. masseter: This muscle is one of the main muscles involved in chewing, as it elevates the mandible to close the jaw. It does not assist with ear movement.

In summary, the auricular muscles are responsible for the lateral movement of the ear.