Which of the following is a salient feature of the upper fibers of the trapezius muscle?
A. They are a source of tenderness and discomfort due to chronic tension.
B. They assist in extension of the head due to their origin on the base of the skull.
C. They depress the scapula and assist in adduction.
D. They are primarily active in positioning the shoulder for function and posture.
Answer: B
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