ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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Lateral view of the skull featuring muscles of mastication (chewing), the first stage of mechanical digestion. The temporalis, masseter, orbicularis oris, and depressor anguli oris muscles are all visible. Voluntary and reflexive muscle movements act together to cut and grind food, combine it with saliva, and compact it into a bolus, a mass of chewed food, to be sent to the stomach.
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