New muscle layer discovered on the jaw (IMAGE) University of Basel Caption The newly discovered muscle layer runs from the back of the cheekbone to the anterior muscular process of the lower jaw. (S= superficial layer, D= deep layer, C= coronoid layer) Credit Jens. C. Türp, University of Basel / UZB Usage Restrictions Only to be used in reporting on research by the University of Basel License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.