An internal skeletal structure or bracing system within or beneath the sternum, especially in arthropods and insects.
From endo- (within) + sternum (breastbone), from Latin and Greek sternon. Zoological term appearing in entomological and arthropod anatomy texts from the 1800s onward.
The endosternum in beetles and flies is like a reinforced internal framework—it's how these tiny creatures can withstand forces dozens of times their body weight!
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