Answer :
Final answer:
Jaw growth is influenced by two sets of facial muscles: the masseter and temporalis muscles, which directly aid mastication, and facial expression muscles which, while not inducing direct expansion of the jawbone, can indirectly influence its shape and size.
Explanation:
The facial muscles can affect jaw growth in two significant ways. Firstly, the masseter and temporalis muscles are pivotal in elevating and closing the jaw, being directly responsible for mastication or chewing. Regular jaw movements like this can manipulate jaw growth.
Next, facial expression muscles play a role too. Although they do not directly induce jawbone expansion, they are attached to the skin around the jaws, and their regular movement can indirectly affect the shape and size of the jaw.
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