The internal skeletal structures or support elements found within the thorax (chest region) of arthropods.
From Greek 'entos' (inside) and 'thorax' (chest armor). This anatomical term combines Greek prefixes to describe the inner chest cavity of arthropods.
An insect's 'entothorax' is basically all the internal bracing in its chest cavity where the flight muscles attach—it's why insects can beat their wings hundreds of times per second.
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