A internal breastbone or skeletal support structure found inside the body of arthropods like insects and crustaceans.
From Greek 'entos' (inside) and Latin 'sternum' (breastbone). This scientific term literally describes a 'breastbone within' the body of invertebrates.
While we have a sternum (breastbone) on the outside of our chest, insects have an 'entosternum'—an inner support beam inside their exoskeleton where muscles anchor to move their legs.
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