Basics of Medical Terminology Practice Test

In anatomy, many Latin-origin nouns ending in -a form their plural with -ae. vertebra follows this pattern, so the plural is vertebrae. This is standard in medical texts and exams, making vertebrae the correct plural form. The other forms aren’t used in formal anatomical terminology: vertebras is an informal, nonstandard plural; vertebrums isn’t used; vertebra's is the possessive form.