QS Study

Ascending Aorta

The aorta is the major artery in the body. The aorta begins at the top of the left ventricle, the heart’s muscular pumping chamber. The ascending aorta rises up from the heart and is about 2 inches long. The coronary arteries branch off the ascending aorta to supply the heart with blood.

Origin

The ascending aorta begins at the base of the ventricle, at the level of lower border of third left costal cartilage. It located obliquely just to the left of the midline at the level of the third intercostal space.

Length: About 5 cm.

Fig – the Ascending aorta and its branches

Course

It ascends obliquely, curving forwards and right behind the left half of the sternum to the level of 2nd left costal cartilage’s upper border. It begins in the left ventricle of the heart. The right and left coronary arteries that supply blood to the heart muscle arise from the ascending aorta.

Here it becomes continuous with the aortic arch.

At its root, it has 3 bulges, the sinuses of the aorta.

Relations

(1) Anterior:

  • Pericardium.
  • Right pleura.
  • Anterior margin of the right lung.
  • Thymic remains.
  • Infundibulum.
  • The initial segment of the pulmonary trunk.
  • Right auricle.

(2) Posterior:

  • Left atrium.
  • Right pulmonary artery.
  • Principal bronchus.

(3) Right lateral:

  • Superior vena cava.
  • Right atrium.

(4) Left lateral:

  • Left atrium.
  • Pulmonary trunk (above).

Branches

  1. Right coronary artery (arises from anterior aortic sinus).
  2. Left coronary artery (arises from left posterior aortic sinus).
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