Final answer:
The corrugator supercilii is the muscle responsible for drawing the eyebrow and creating vertical wrinkles on the forehead. It is involved in facial expressions such as frowning.
Step-by-step explanation:
The muscle that draws the eyebrow and wrinkles the forehead vertically is the corrugator supercilii. This muscle is the prime mover of the eyebrows, allowing for expressions such as frowning and looking surprised. The corrugator supercilii is one of several small facial muscles responsible for various expressions. It works alongside other muscles such as the occipitofrontalis, which has two parts: the frontal belly that helps in raising the eyebrows and the occipital belly at the back of the skull. The action of these muscles, particularly the corrugator supercilii, can be felt by placing a finger on the eyebrows near the bridge of the nose and alternately raising and lowering the eyebrows.
The muscle that draws the eyebrow and wrinkles the forehead vertically is the corrugator supercilii. It is one of the small facial muscles responsible for moving the eyebrows. When you raise your eyebrows as if you were surprised or frown, you can feel the action of the corrugator supercilii.