Superficial Muscles of the Body

“A single muscle rarely or never contracts alone, but always in harmony with a number of other muscles. Even the simplest movement we can make requres the combined action of several muscles to carry it out. If the movement is at all difficult, such as playing on the piano or riding on the bicycle, the different muscles must contract in a certain order and with a certain strength and rapidity.” — Blaisedell, 1904

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