The heart Position Lies within the pericardium in middle mediastinum Behind the body of sternum and coastal cartilages 2 to 6 In front of thoracic vertebrae 5 to 8 a third of it lies to the right of median plan and 2/3 to the leftThe heart Position ◼ Lies within the pericardium in middle mediastinum ◼ Behind the body of sternum and coastal cartilages 2 to 6 ◼ In front of thoracic vertebrae 5 to 8 ◼ A third of it lies to the right of median plan and 2/3 to the left