Which term means inside?

Which term means inside?

• A. Inra
• B. Infra
• C. Sub
• D. Extra

Answer: (A)

Inside is shown by the prefix intra-. This prefix comes from Latin and means within or inside a structure, so it forms terms like intramuscular (inside the muscle) or intracranial (inside the skull). The option that looks similar, “Inra,” is not the standard spelling of the prefix; the correct form is intra-. Other prefixes have different directions: infra- means below or beneath (infraorbital, for example), sub- also means under, and extra- means outside or beyond. Understanding these spatial prefixes helps you quickly grasp where something is relative to another structure.

Inside is shown by the prefix intra-. This prefix comes from Latin and means within or inside a structure, so it forms terms like intramuscular (inside the muscle) or intracranial (inside the skull). The option that looks similar, “Inra,” is not the standard spelling of the prefix; the correct form is intra-. Other prefixes have different directions: infra- means below or beneath (infraorbital, for example), sub- also means under, and extra- means outside or beyond. Understanding these spatial prefixes helps you quickly grasp where something is relative to another structure.