Zygomaticus major :-
Muscle details :-

zygomaticus major muscle
Zygomaticus major shown in red. It is a muscle of facial expression which draws the angle of the mouth superiorly and posteriorly to allow one to smile.
Origin :-
Anterior surface of zygomatic bone.
Insertion :-
Modiolus at angle of mouth.
Nerve supply :-
Buccal branch of facial nerve (VII).
Action :-

zygomaticus major muscle action
Elevates and draws angle of mouth laterally.
Related pathology :-
In Bell’s palsy zygomaticus major muscle commonly paralysis .