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Saturday, June 28th, 2003
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11:51p - Chewing
It is easy to take for granted that we know, roughly, how our own bodies move.
This evening while I was eating white rice and spring rolls at Cheung Shing, I looked into the mirror above the counter and was surprised by the manner of movement of my own face. I hadn't realized that the muscle above the temple was so involved in the mouth-opening and -closing process. According to Gray's Anatomy (1918):
The mandible… is elevated by the Masseter, Pterygoideus internus, and the anterior part of the Temporalis. It is drawn forward by the simultaneous action of the Pterygoidei internus and externus, the superficial fibers of the Masseter and the anterior fibers [fascia] of the Temporalis; and backward by the deep fibers of the Masseter and the posterior fibers [fascia] of the Temporalis (see illustration).
Perhaps I didn't notice this because I don't normally observe myself chewing or speaking. I imagine I would have noticed it in other people though.
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