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ribs-outline - Ribs Sternum page 1 of 4 ANAT 51210 Fall...

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Ribs & Sternum page 1 of 4 ANAT 51210 Lectures 19 & 20 Fall 2011 Osteology of the Ribs and Sternum I. Thoracic cage A. Composed of the ribs, costal cartilages, sternum, and thoracic vertebrae B. Functions in protection and support, assists with respiration II. Ribs: 12 pairs A. True ribs vs. false ribs; floating ribs 1. True ribs: ribs 1-7 (direct attachment to the sternum) 2. False ribs: ribs 8-12 (no direct attachment to the sternum) a. Floating ribs: ribs 11 and 12 (no attachment to the sternum) B. Typical ribs: ribs 3-9 1. Capitulum costae (aka, head) a. Superior articular facet: articulating with the inferior costal demi-facet of a thoracic vertebra (thoracic vertebra # = [rib # - 1]) b. Inferior articular facet: articulating with the superior costal demi-facet of a thoracic vertebra (thoracic vertebra # = rib #) c. Interarticular crest: bony ridge found between the superior and inferior articular facets; ligament attachment site 2. Collum costae (aka, neck) a. Crest: ridge on the superior surface 3. Tubercle
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