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Webster 1913 Edition

Noun.

[Pref.

apo-

+ Gr. [GREEK] body.]

(Zool.)

One of the processes of the shell which project inwards and unite with one another, in the thorax of many Crustacea.

apodeme ‎(plural apodemes)

(anatomy) An ingrowth of the arthropod exoskeleton, serving as an attachment site for muscles.
- 2007 November 20, C. Claiborne Ray, “Ant Power”, in New York Times:
  The muscles are attached either directly to internal protrusions of its external skeleton, called apodemes, or indirectly, by filaments attached to the connection points.

an ingrowth of the arthropod exoskeleton, serving as an attachment site for muscles