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Thoracic Cage composed of ribs, costal cartilages, sternum, and thoracic vertebrae protection, support, assists with respiration Functions of thoracic cage 12 How many total ribs? 1-7 What ribs are considered "true ribs" true ribs Ribs that are directly attached to the sternum 8-12 What ribs are considered "false ribs" false ribs Ribs that are not directly attached to the sternum floating ribs Ribs 11 and 12 that have no attachment to the sternum are called.... 3-9 What ribs are considered typical ribs? Capitulum costae Head of the rib Superior articular facet Articulating with the inferior costal demi-facet of a thoracic vetebra (thoracic vertebra # = [rib # - 1]) Inferior articular facet Articulating with the superior costal demi-facet of a thoracic vetebra (thoracic vertebra # = rib #) Interarticular crest Bony ridge found between the superior and inferior articular facets; ligament attachment site Collum costae Neck of rib Crest Ridge on the superior surface of collum costae Articular facet articulation with the transverse costal facet of the thoracic vertebra (thoracic vertebra # = rib #); positioned more inferiorly and proximally on the bone Non-articular facet site of the ligamentous attachment between the rib and the transverse process of the thoracic vertebra; positioned more superiorly and distally on the bone Corpus costae shaft or body of rib costal angle, costal groove, costal cartilage surface Parts of Corpus costae Costal groove Located on the inferior deep border of the rib (on the corpus costae) Costal cartilage surface Attachment site for the costal cartilage, on distal end of corpus costae 1, 2, 3, 10, 11, 12 Atypical ribs