Answer: The muscle of the scalp that raises the eyebrows, draws the scalp forward, and causes wrinkles across the forehead is the Frontalis. The correct option is b.
Step-by-step explanation:
The Frontalis muscle is a broad, thin muscle located in the forehead region. It is responsible for various movements and expressions involving the eyebrows and forehead.
1. Location and structure: The Frontalis muscle spans across the forehead region from the top of the skull to the eyebrows. It is a paired muscle, meaning there is a Frontalis muscle on each side of the forehead.
2. Eyebrow elevation: The primary function of the Frontalis muscle is to raise the eyebrows. Contraction of the Frontalis muscle pulls the eyebrows upward, causing them to elevate. This movement is important for expressing surprise or curiosity.
3. Scalp forward movement: In addition to eyebrow elevation, the Frontalis muscle can also draw the scalp forward. Contraction of the muscle pulls the skin of the forehead and scalp forward, causing a forward movement. This action can be observed when someone raises their eyebrows while wrinkling their forehead.
4. Wrinkles across the forehead: When the Frontalis muscle contracts, it creates wrinkles across the forehead region. These wrinkles are visible lines or creases that form as a result of the muscle's action. They are commonly known as forehead wrinkles or worry lines.
In summary, the Frontalis muscle is responsible for raising the eyebrows, drawing the scalp forward, and causing wrinkles across the forehead. Its contraction produces movements and expressions associated with surprise, curiosity, and certain facial expressions. The Temporalis muscle is involved in jaw movement and chewing, the Orbicularis oculi muscle controls eyelid closure, and the Buccinator muscle aids in actions such as blowing air and chewing, but they are not directly involved in the movements described in the question.