The buccinator muscle and its vasculars and nerve were revealed and observed. 显露颊肌及其血管和神经。
The risorius and the buccinator muscles assist in the retraction of the lips, as well as support entrapment of air within the oral cavity. 笑肌和颊肌帮助唇的收缩，也支撑了整个口腔的气体流通。
