IMPORTANT muscles to know: 

    Muscle: Origin:   Insertion :

1- m. Masseter           Zygomatic arch                            Lateral Mandible 

2- m. Digastricus              Caudal to temporomandibular joint.            Medial mandible 

3- m. Temporalis         Temporal fossa                    Coronoid process of the mandible

4- m. Mylohyoideus - Forms the floor of the oral cavity; located between the rami of the mandible.

m. Pterygoideus       Pterygoid bone               Medial Mandible