Question

multiple choice question

which muscle has an attachment to the dermis of the lips?

orbicularis oris
risorius
buccinator
depressor anguli oris

Explanation:

Identify the target muscle of the lips

Using the Facial Expression Muscles knowledge point, we analyze the anatomical attachments of the muscles surrounding the mouth. The muscle that directly encircles the mouth and inserts into the dermis and submucosa of the lips is the orbicularis oris.

Compare with other options

Using the Buccinator Muscle Anatomy knowledge point, we know the buccinator forms the wall of the cheek and inserts into the fibers of the orbicularis oris rather than directly attaching to the dermis of the lips. The risorius draws the corner of the mouth laterally, and the depressor anguli oris depresses the corner of the mouth. Thus, the primary muscle attaching directly to the dermis of the lips is the orbicularis oris.

Answer:

• Orbicularis oris (Correct answer)
• Risorius
• Buccinator
• Depressor anguli oris