1) Anatomical structure 2) Bodily structure 3) Body structure 4) Complex body part 5) Structure 
• (n.) One of the processes of the shell which project inwards and unite with one another, in the thorax of many Crustacea.
[2 related articles]
Spine-like inward projection of the cuticle in arthropods on which muscle is attached.
Ap'o·deme noun [ Prefix apo- + Greek ... body.] (Zoology) One of the processes of the shell which project inwards and unite with one another, in the thorax of many Crustacea. 
[n] - ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles
noun ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles
a ridgelike ingrowth of the exoskeleton of an arthropod that supports the internal organs and provides the attachment points for the muscles.