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Background:The palmaris longus muscle is a slender fusiform muscle. It is especially prone to vary in comparison to other muscles in the upper limb and it is considered to be a vestigial structure. It is the most variable muscle in the human body, although its reverted state is barely discussed. The palmaris longus inversion can cause compression on neurovascular bundles, specially the median nerve on the carpal tunnel and the ulnar nerve on the Guyon canal.

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