The deep hollow here between the buccinator and masseter muscles is filled with this buccal fat pad, which is continuous with the fat that covers the front of the cheek.Now we'll return to the picture all except one of the muscles that pull on the orbicularis oris. Pulling on it from above and behind is the zygomaticus major, which arises from here on the zygomatic bone. Pulling on it from behind is the risorius muscle. We use both these muscles when we smile.
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