The deltoid muscle, all fibers, perform which primary action?

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Multiple Choice

The deltoid muscle, all fibers, perform which primary action?

Explanation:
The deltoid as a whole is best known for lifting the arm away from the body. When all its fibers engage, they pull the humerus upward in the frontal plane, producing shoulder abduction. The middle fibers are the primary drivers of this movement, while the anterior fibers assist with flexion and medial rotation and the posterior fibers assist with extension and lateral rotation. The first portion of abduction is actually initiated by the supraspinatus, but once that initial range is achieved, the deltoid—especially its middle fibers—continues the abduction.

The deltoid as a whole is best known for lifting the arm away from the body. When all its fibers engage, they pull the humerus upward in the frontal plane, producing shoulder abduction. The middle fibers are the primary drivers of this movement, while the anterior fibers assist with flexion and medial rotation and the posterior fibers assist with extension and lateral rotation. The first portion of abduction is actually initiated by the supraspinatus, but once that initial range is achieved, the deltoid—especially its middle fibers—continues the abduction.

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