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LAST MINUTE REVISION CARDIAC ANATOMY…., Part 1…, A is of heart runs from the right shoulder to the left, hypochondrium., One third of cardiac mass lies on right and two, third on the left., Upper six ribs join with the vertebrae posteriorly, and sternum anteriorly., Ribs 7 to 10 articulates with the Vertebral element, posteriorly and then fuse their anterior costal, cartilage into the flexible costal margin., 11 and 12 ribs articulates with thoracic vertebrae, but are unattached anteriorly., They are referred to as floating ribs., Anterior intercostal artery and vein arise from, internal thoracic artery., Posterior intercostal artery arise from descending, thoracic aorta… 3 to 12 in numbers.