The nerve that innervates the buccal muscle movement is called the buccal branch of the facial nerve.
The main function of the buccal muscle is to innervate the corners of the mouth, lifting backward and outward, with the function of chewing and assisting sucking. If it is damaged, there will be drooping of the corners of the mouth, shallow nasolabial folds, weakness in chewing, and weakness in sucking and blowing and puffing the cheeks.
The buccal branch may have two to six branches, which are divided from the temporal and cervical common trunk. The buccal branch innervates the buccal muscles, orbicularis oris muscles, upper lip square muscles and zygomatic muscles. The buccal branch has an anastomotic branch with the buccal nerve of the mandibular nerve.
The facial nerve divides into the buccal branch of the facial nerve, which innervates the facial expression muscle movement. If paralysis or spasm of the facial nerve occurs, which affects the facial movement and mastication function, it should be consulted to the Neurology Department of the hospital in time.