Final answer:
The corrugator supercilii muscle draws the eyebrows together.
Step-by-step explanation:
The muscle that draws the eyebrows together is called the corrugator supercilii. It is one of the several small facial muscles responsible for facial expressions. The corrugator supercilii is the prime mover of the eyebrows, allowing you to raise and lower them as if you were surprised or frowning.