COMLEX USA Comprehensive Osteopathic Medical Licensing Examination Practice 2025 - Free COMLEX Practice Questions and Study Guide

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Which ribs are considered 'true' ribs?

Ribs 1-7

True ribs are classified as those which have a direct attachment to the sternum via their costal cartilage. In human anatomy, the first seven pairs of ribs (ribs 1 through 7) are designated as true ribs because they each connect individually to the sternum in this manner. This anatomical feature plays a significant role in protecting vital organs in the thorax and supporting respiratory mechanics.

In contrast, the ribs numbered 8 through 10 are termed false ribs because they do not attach directly to the sternum; instead, their costal cartilages connect to the cartilage of the rib above. Ribs 11 and 12 are classified as floating ribs, as they do not have any anterior attachment to the sternum or cartilage. The distinction among these rib categories is based on their structural connections rather than their external appearances or position in the thoracic cage.

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Ribs 8-10

Ribs 11-12

Ribs 6-8

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