Q:

What is the function of the deltoids?

A:

Quick Answer

The deltoids move the upper arm up and away from a neutral position at the side. They each have three different major regions, each with different attachment points around the shoulders. Each of these regions moves the arm in a different direction when flexed.

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Full Answer

All three major regions of the deltoids attach to the same point on the humerus. The region most toward the front of the body moves the arm up and toward the collarbone. The middle region moves the arm straight up and forward, as when throwing a ball underhand. The rear region lifts the arm directly out to the side.

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Related Questions

  • Q:

    What muscle allows you to raise your arm laterally?

    A:

    The deltoids are the muscles that allow humans to raise their arms laterally. In addition to the deltoids, there are several other muscles groups that assist in lateral motion.

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  • Q:

    What are the movements of the deltoids?

    A:

    Deltoid muscles, situated in the shoulders, are responsible for the majority of arm movements, including arm abduction, arm flexion and medial rotation, and arm extension and lateral rotation. These movements involve the deltoids working with the rotator cuff muscles, supraspinatus, pectoralis major, infraspinatus, terres minor and terres major.

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  • Q:

    What are the muscles of the upper arm?

    A:

    The muscles of the upper arm that are visible from the outside are the biceps brachii, the triceps brachii, the brachioradialis and the extensor carpi radialus longus. The coracobrachialis and brachialis are deeper upper arm muscles. The deltoid muscle is a shoulder muscle that increases the arm's range of motion.

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  • Q:

    What is the function of the triceps?

    A:

    The main purpose of the triceps is to extend the elbow and straighten the arm. The triceps is located on the back of the arm and attaches to the upper arm around the shoulder and then again to the elbow, but it originates at the shoulder blade. The muscle works opposite to the bicep that is located on the opposite side of the arm.

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