Question

question 52 of 100
which muscle opens and closes the jaw?
select the correct response:
risorius
mentalis
masseter
temporalis

Explanation:

The masseter is the primary muscle responsible for closing the jaw, and its paired action (along with the relaxation of jaw-opening muscles) also facilitates jaw movement including opening. The risorius controls facial smiling movements, the mentalis affects the chin, and the temporalis primarily assists in jaw closing but not the full open/close range like the masseter.

Answer:

masseter