An alternate spelling of cephalorachidian; relating to the head and spinal cord.
From Greek 'kephale' (head) + 'rhachis' (spine). This is a variant spelling using 'o' as a connecting vowel, both spellings coexist in medical literature from different traditions.
In medical terminology, variant spellings often reveal the history of translation and adaptation—some doctors learned from German texts (which favored 'rh'), others from French, creating spelling variations that both refer to exactly the same anatomy.
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