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The structures at the bottom of this image that look like scales are actually bundles of muscles just under the skin of a rabbit. This image is a stained cross section taken under polarized light ...
A trigger point is an area of muscle that causes referred pain. It may twitch, and you may feel a knot or tightness under the skin. A trigger point is not the same as a tender spot.
Below the fat pads and above the bones of the skull are the facial muscles. You can smile, frown, raise your eyebrows, chew and do other facial movements all thanks to these muscles, Alam added.
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