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Related Experiment Videos

The function of the anconeus muscle.

T F Gleason, W M Goldstein, R D Ray

    Clinical Orthopaedics and Related Research
    |January 1, 1985
    PubMed
    Summary

    The anconeus muscle actively contracts during forearm pronation around the second digit, functioning to abduct the ulna. This study confirms the anconeus

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    Area of Science:

    • Anatomy
    • Biomechanics
    • Physiology

    Background:

    • The role of the anconeus muscle in forearm motion is not fully understood.
    • Pronation can occur around different axes, influencing forearm bone positioning.

    Purpose of the Study:

    • To investigate whether the anconeus muscle contracts during specific types of ulna abduction.
    • To clarify the anconeus muscle's function during forearm pronation.

    Main Methods:

    • Electromyography (EMG) was used to record anconeus muscle activity in five subjects.
    • Muscle activity was measured during various elbow positions and forearm pronation/supination movements.
    • Pronation was analyzed around two distinct axes: through the second digit and through the fifth digit.

    Main Results:

    • Pronation around an axis through the second digit elicited the highest amplitude and recruitment of motor unit action potentials in the anconeus muscle.
    • This specific pronation movement demonstrated significant anconeus muscle activation.

    Conclusions:

    • The findings provide evidence that the anconeus muscle functions as an abductor of the ulna.
    • The anconeus muscle plays a role in stabilizing the ulna during specific forearm rotational movements.

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