An abnormal condition of the spinal column where the vertebrae are unequally sized or irregularly shaped.
From Greek 'hetero-' (different) + 'rhachis' (from 'rhachis' meaning spine or backbone). This is a medical term that appeared in anatomical and pathological literature.
Heterorhachis can occur in genetic conditions where vertebrae don't develop uniformly, and some creatures like snakes have naturally variable vertebrae that make their spines incredibly flexible.
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