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Protruding auricle: A neuromuscular sign

D W Smith

    Lancet (London, England)
    |April 8, 1978
    PubMed
    Summary

    A protruding auricle, or prominent ear, may indicate a neuromuscular disorder due to posterior auricular muscle dysfunction. This finding is similar to ptosis, another potential sign of neuromuscular conditions.

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    Area of Science:

    • Anatomy
    • Neuromuscular Medicine
    • Developmental Biology

    Background:

    • The posterior auricular muscle plays a crucial role in retracting the auricle (pinna) towards the calvarium.
    • Developmental abnormalities or functional deficits of this muscle can alter ear positioning.
    • Prominent auricle is a common congenital condition with various potential underlying causes.

    Observation:

    • Protruding auricle (prominent ear) is frequently observed.
    • This condition is often linked to developmental or functional issues of the posterior auricular muscle.
    • Ptosis, or drooping eyelid, shares a similar association with neuromuscular disorders.

    Findings:

    • A defect in the posterior auricular muscle's development or function is associated with a protruding auricle.
    • The normal function of the posterior auricular muscle is to draw the pinna towards the head.
    • Therefore, a protruding auricle can serve as a potential indicator of an underlying neuromuscular disorder.

    Implications:

    • This association suggests that prominent ears may warrant further investigation for neuromuscular conditions.
    • Understanding the muscular basis of ear prominence can aid in diagnosing related disorders.
    • Further research into the embryology and innervation of the posterior auricular muscle may reveal more about associated conditions.

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