Arkansas Esthetician Practice Exam

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What is the function of the Sternocleidomastoideus?

Turns the palm up
Moves the head from side to side and up and down
Separates the fingers
Bends the wrist

The correct answer is: Moves the head from side to side and up and down

The sternocleidomastoideus, commonly referred to as the SCM muscle, is primarily responsible for rotating and tilting the head. This movement allows you to turn your head from side to side and also move it up and down. The other options are incorrect because they describe actions of different muscles in the body. For example, turning the palm up is performed by the supinator muscle in the forearm, separating the fingers is the function of the abductor muscles in the hand, and bending the wrist is controlled by the wrist flexor muscles. Therefore, the SCM muscle is not involved in those actions and B is the correct answer.