What are the components of the sternum?

• A. Manubrium, axis, and xiphoid process
• B. Manubrium, corpus, and xiphoid process
• C. Body, spine, and xiphoid process
• D. Manubrium, corpus, and cervical process

Answer: (B)

The components of the sternum include the manubrium, corpus, and xiphoid process. The manubrium is the uppermost part of the sternum, where the clavicles attach and the first pair of ribs connect. Below this is the corpus (or body of the sternum), which makes up the bulk of the sternum and serves as the attachment site for the true ribs (ribs 1-7). Finally, the xiphoid process is the small, cartilaginous projection at the lower end of the sternum, which is important for muscle attachment and can sometimes ossify with age.

This option accurately lists all three major parts of the sternum, reflecting their anatomical significance. Other options contain incorrect terminology or components that do not belong to the structure of the sternum. For instance, "axis" refers to the second cervical vertebra, unrelated to the sternum. Similarly, terms like "body" and "cervical process" might suggest misleading anatomical associations, as the sternum specifically comprises the aforementioned components.