The left coronary artery arises from the left posterior aortic sinus and supplies blood to the left side of the heart. It has branches including the left conus artery, left marginal branch, and circumflex branch. The right coronary artery arises from the right posterior aortic sinus and supplies blood to the right side of the heart, with branches such as the right conus artery and right marginal branch. The aorta receives oxygenated blood from the left ventricle and distributes it throughout the body.

1. Left conus artery
Left marinal branch
Circumflex branch
The right coronary artery
The right conus artery
The right marginal branch

2.  The aorta is the great
arterial trunk which
receives oxygenated blood
from the left ventricle and
distributes it to all part of
the body through systemic
circulation.
 It is about 3cm in diameter

3. As the left and right coronary arteries run
on the surface of the heart, they can be called
epicardial coronary arteries.
 These arteries, when healthy, are capable of
autoregulation to maintain coronary blood flow
at levels appropriate to the needs of the heart
muscle.
 These relatively narrow vessels are
commonly affected by atherosclerosis and can
become blocked, causing angina or a heart
attack
Right coronary artery is smaller than the left
coronary artery
It arises from the anterior aortic sinus of
ascending
Left coronary artery is arises from the left
posterior aortic sinus of ascending aortic.

4. 


5. This is the first branch of the arch of the aorta ,its origin lies more or less in the
median plane, in front of the trachea
It end behind the sternoclavicular joint by dividing into the right common carotid
and right subclavian arteries.
The left common carotid artery arises from the arch a little to the left of the
brachiocephalic artery. Its origin also lies in fornt of the trachea.
It enters the neck by passing deep to the sternoclavicular joint.
The left subclavian artery arises from the arch of the aorta a little to the aorta
a little to the left of and behind the left common carotid artery, the origin lying to
the left of the trachea
The artery runs almost vertically along the left side of the trachea to enter the
neck at level of the left sternoclavicular joint, where it lies behind the common
carotid.

6.  The descending thoracic aorta is
continuous with the lower end of the arch.
It descendes in front of the thoracic
verterbrae gradually passing from the left
side towards the median plane .
 At level of the lower border of the twelfth
thoracic vertebra it passes through the
aortic orifice of the diaphragm to enter
the abdomen.
 The descending thoracic aorta becomes
continuous with the abdominal aorta that
decends in front of the lumbar vertebrae.
 Apart form several small branches to the
oesophagus, the pericardium [phrenic
branches] and to lymph node in the
posterior mediastinum [mediastinal
branches] it gives off the bronchial
posterior intercostal and subcostal
arteries.

8.  The descending thoracic aorta is
continuous with the lower end of the arch.
It descendes in front of the thoracic
verterbrae gradually passing from the left
side towards the median plane .
 At level of the lower border of the twelfth
thoracic vertebra it passes through the
aortic orifice of the diaphragm to enter
the abdomen.
 The descending thoracic aorta becomes
continuous with the abdominal aorta that
decends in front of the lumbar vertebrae.
 Apart form several small branches to the
oesophagus, the pericardium [phrenic
branches] and to lymph node in the
posterior mediastinum [mediastinal
branches] it gives off the bronchial
posterior intercostal and subcostal
arteries.