What is the plural form of 'vertebra'?

The plural form of 'vertebra' is 'vertebrae.' This follows a common convention in English where words derived from Latin maintain their original Latin pluralization rules. In Latin, 'vertebra' is a feminine noun, and its plural is formed by changing the ending from 'a' to 'ae,' resulting in 'vertebrae.'

This linguistic origin is reflected in how many medical and anatomical terms are utilized in English, retaining their Latin roots for consistency and clarity in medical communication. The other options do not accurately represent the correct pluralization of the term based on standard English usage or Latin grammar.