The anterior or head region of an arthropod body, especially in crustaceans.
From Greek 'kephale' (head) + '-some' (body, from 'soma'). In biology, '-some' denotes a distinct body part or structure.
Biologists use '-some' to name distinct body regions—chromosome, lysosome, cephalosome—it's a precise way to carve up anatomy into functional units that often reveal evolutionary history.
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