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ANAT 1507 Ribs and Sternum Outline

ANAT 1507 Ribs and Sternum Outline - Ribs Sternum page 1 of...

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Ribs & Sternum page 1 of 4 ANAT 210 Lectures 19 & 20 Fall/Winter 2008/2009 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 & 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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Ribs & Sternum page 2 of 4 a.
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