O: Medial surface of lat. pterygoid and pterygoid fossa

I: Medial ramus and angle of mandible

A: elevation and contralateral deviation

I: V₃

O:                                                               

-Sup. head: infratemporal crest

-Inf. head: lat surface of lateral pterygoid

I: Articular disc and neck of condyle

A:                                                                 

-both: depression and protrussion

-unilateral: lateral deviation

I: V₃

O: Temporal line

I: Coronoid process and temporal crest

A: elevation and retraction (deep fibers only)

I: V₃

O:                                                                   

-Superficial: zygomatic process of maxilla, ant 2/3 of zygmatic arch

-Deep: Inner surface of post 1/3 of zygomatic arch

I:                                                                    

-Superificial: angle and lower lat. ramus

-Deep: Sup part of ramus and lateral coronoid

A: elevation (both), retraction (deep), protrusion (superficial)

I: V₃