What anatomical structure is indicated by the prefix "stern/o"?

The prefix "stern/o" specifically refers to the sternum, which is the flat bone located at the front of the chest. It plays a crucial role in protecting the heart and lungs by forming part of the ribcage structure. The use of prefixes and roots in medical terminology often provides insight into the specific anatomical or physiological concepts being discussed. In this case, "stern/o" clearly indicates a connection to the sternum, making it the correct choice.

The other options do not directly relate to the prefix "stern/o." The spine pertains to the vertebral column, breathing relates to respiratory functions or processes, and the spleen is an organ involved in immune response and filtering blood. None of these terms share the same prefix or root structure that would connect them to the sternum in medical terminology.