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The facial artery can be distinctly felt as it passes over the upper jaw at the front edge of the masseter muscle. The pulse of a sleeping child can often be counted at the anterior fontanelle by the eye alone. About one inch above the clavicle, near the outer border of the sterno-mastoid, we can feel the pulsation of the great subclavian artery.
One of the most powerful of them, the 'masseter', rises from the superior maxillary bone, and spreads over its whole extent: therefore, that bone is developed, while the nasal bone is compressed into a very small space.
In some cases, the muscles of the neck are the principal seat of the disease, or some muscle of the face; the temporal muscle beating like an artery; the masseter opening and closing the mouth, the muscles of the eyelid, and, in a few cases, those of the eye itself being affected.
In the curious experiments of Regnard and Blanchard at the Sorbonne, it was found that a crocodile weighing about 120 pounds exerted a force between its jaws at a point corresponding to the insertion of the masseter muscles of 1540 pounds; a dog of 44 pounds exerted a similar force of 363 pounds.
Some of those that are prominent enough to be felt at the surface are as follows: Of the head: The temporal, in the temple, and the masseter, in the cheek. These muscles are attached to the lower jaw and are the chief muscles of mastication. Of the neck: The sterno-mastoids, which pass between the mastoid processes, back of the ears, and the upper end of the sternum.
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