In insects, the inner or internal wall and skeletal structures that form the internal framework of the thorax (middle body section).
From Greek 'endo-' (within) and 'thorax' (chest or middle section), used in entomology to distinguish the internal skeleton-like framework from the external chitinous covering of insects.
Insects have a built-in suit of armor—their endothorax is like an internal skeleton made of chitin that provides attachment points for the incredibly powerful flight muscles that let flies hover and bees work all day.
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