From ZooTerms (Dictionary of Invertebrate Zoology)
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endosternite (noun; Greek endon, within; sternon, chest): 1. (Arthropoda) In various arthropods, an internal sclerotized ridge, plate or other process of the cephalic exoskeleton that functions for muscle and connective tissue attachment; sometimes called entosternite.

2. (Arthropoda: Crustacea) a. In Notostraca, the mesodermal plate beneath the anterior portion of the alimentary canal. b. In certain Decapoda, a firm calcareous plate of the anterior thorax between the nerve cord and alimentary canal.

3. (Arthropoda: Insecta) see apophyses.