Question 1

What is the frontalis muscle?

Accepted Answer

The frontalis muscle is a thin, paired muscle located in the forehead region of the face. It is one of the muscles comprising the epicranius muscle group, including the occipitalis muscle.

Question 2

What is the structure of the frontalis muscle?

Accepted Answer

The frontalis muscle is a broad, flat muscle covering the skull's frontal bone. It originates from the galea aponeurotica, a tough, fibrous layer of connective tissue on the top of the head and inserts into the skin of the eyebrows and forehead.

Question 3

What are the functions of the frontalis muscle?

Accepted Answer

The primary function of the frontalis muscle is to raise the eyebrows and wrinkle the forehead. It also plays a role in expressing emotions such as surprise or concern.

Question 4

What are the actions of the frontalis muscle?

Accepted Answer

The main actions of the frontalis muscle include elevating the eyebrows and causing horizontal wrinkling of the forehead. This muscle opposes the occipitalis muscle, which pulls the scalp posteriorly.

Question 5

What is the main movement of the frontalis?

Accepted Answer

The main movement of the frontalis muscle is to raise the eyebrows and wrinkle the forehead. This muscle is responsible for facial expressions such as surprise or concern. It originates from cranial aponeurosis and inserts into the eyebrows' skin and the nose's bridge. Contraction of the frontalis creates forehead wrinkles and lifts the eyebrows.

Physical Medicine & Rehabilitation