The Temporalis and Masseter Muscles Close the Jaw While the Platysma

question 48

Multiple Choice

The temporalis and masseter muscles close the jaw while the platysma opens the jaw.To clench your teeth,which of the following must occur?

• A)Contract temporalis and masseter and relax platysma
• B)Relax temporalis and masseter and contract platysma
• C)Contract temporalis, masseter, and platysma
• D)Relax temporalis, masseter, and platysma
• E)Contract temporalis and relax platysma and masseter

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