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Systemic arteries

This diagrams shows the major arteries in the human body.
The major systemic arteries shown here deliver oxygenated blood throughout the body.

The aorta

The aorta    is the largest artery in the body ( [link] ). It arises from the left ventricle and eventually descends to the abdominal region, where it bifurcates at the level of the fourth lumbar vertebra into the two common iliac arteries. The aorta consists of the ascending aorta, the aortic arch, and the descending aorta, which passes through the diaphragm and a landmark that divides into the superior thoracic and inferior abdominal components. Arteries originating from the aorta ultimately distribute blood to virtually all tissues of the body. At the base of the aorta is the aortic semilunar valve that prevents backflow of blood into the left ventricle while the heart is relaxing. After exiting the heart, the ascending aorta    moves in a superior direction for approximately 5 cm and ends at the sternal angle. Following this ascent, it reverses direction, forming a graceful arc to the left, called the aortic arch    . The aortic arch descends toward the inferior portions of the body and ends at the level of the intervertebral disk between the fourth and fifth thoracic vertebrae. Beyond this point, the descending aorta    continues close to the bodies of the vertebrae and passes through an opening in the diaphragm known as the aortic hiatus    . Superior to the diaphragm, the aorta is called the thoracic aorta    , and inferior to the diaphragm, it is called the abdominal aorta    . The abdominal aorta terminates when it bifurcates into the two common iliac arteries at the level of the fourth lumbar vertebra. See [link] for an illustration of the ascending aorta, the aortic arch, and the initial segment of the descending aorta plus major branches; [link] summarizes the structures of the aorta.


This diagram shows the aorta and the major parts are labeled.
The aorta has distinct regions, including the ascending aorta, aortic arch, and the descending aorta, which includes the thoracic and abdominal regions.
Components of the Aorta
Vessel Description
Aorta Largest artery in the body, originating from the left ventricle and descending to the abdominal region, where it bifurcates into the common iliac arteries at the level of the fourth lumbar vertebra; arteries originating from the aorta distribute blood to virtually all tissues of the body
Ascending aorta Initial portion of the aorta, rising superiorly from the left ventricle for a distance of approximately 5 cm
Aortic arch Graceful arc to the left that connects the ascending aorta to the descending aorta; ends at the intervertebral disk between the fourth and fifth thoracic vertebrae
Descending aorta Portion of the aorta that continues inferiorly past the end of the aortic arch; subdivided into the thoracic aorta and the abdominal aorta
Thoracic aorta Portion of the descending aorta superior to the aortic hiatus
Abdominal aorta Portion of the aorta inferior to the aortic hiatus and superior to the common iliac arteries

Coronary circulation

The first vessels that branch from the ascending aorta are the paired coronary arteries (see [link] ), which arise from two of the three sinuses in the ascending aorta just superior to the aortic semilunar valve. These sinuses contain the aortic baroreceptors and chemoreceptors critical to maintain cardiac function. The left coronary artery arises from the left posterior aortic sinus. The right coronary artery arises from the anterior aortic sinus. Normally, the right posterior aortic sinus does not give rise to a vessel.

Questions & Answers

why does the material not allow in mri
Simran Reply
what is the meaning of sutures
Ibrahim Reply
i do not know
immovable joints btn two bones.eg the skull bones
Really,it's true
Sutures are immovable junction between two bones e.g those of the skull
what should I do to get or to know what to do for me to be excellent in the course of anatomy and physiology
Sandra Reply
study harder
Between the heart and the Brain which one is more important to human being... discuss
Faith Reply
well the brain is important for motor skills, the heart is important for involuntary muscle movement supporting body functions. the body can survive without brain involvement, but the body cannot last without the heart
granted the heart is important, but the brain gives the body purpose
the brain is more important
Even though the brain helps the human being to behave normally and purposefully, I think the heart is much more important cos human being cannot live without the heart
change the question
hello guys
it is difficult to select which organ is more important, now you can replace the heart with a mechanical device and the body could still function, and with technology today brain activity can also be replicated. But life would not be the same
there's coordination btn the two..so without any of them no life
the heart
The brain is important to humans.
what is homeostasis
Rebecca Reply
what is the composition of saliva
Vijay Reply
ഫസ്റ്റ് ചാപ്റ്റർ ഇംപോർട്ടൻസ് പോസ്റ്റ്
Reshma Reply
nhi samjh aya
Nhi wt is this
I don't know
Okk wre frm u r
what is mean of? reshma
I don't know but would like to
D bone in d ankle joint re what ?
Ifunanya Reply
can one define a cell as a basic unit of a living organism
Michael Reply
cell is the structural and functional unit of living organisms
Which of the following hormones are responsible for the adolescent growth spurt? estrogen and testosterone, even in women?
Kepa Reply
estrogen hormone
yes estrogen hormone
What is sling give d characteristics of sling uses of sling
adamu Reply
a sling a rope used in hunting ie throwing of rocks
I went to learn anatomy of joints
Arman Reply
me 2
joint have 3 cartilaginous joint fibrous joint synovial joint U can reserch in Google can explain U well
define sling
To throw with a circular or arcing motion
pls hux I was given an assignment,, Between the heart and Brain which one is more important to human being... discuss
what is respiration
Osele Reply
what is respiration
Respiration is the process by which oxygen is taken in and carbon dioxide is given out.
Respiration is the combination of inhalation and exhalation.
inhalation is the taking in air from environment to lung and exhalation is taking out sir from the lung to environment ..
is the process by wich gases(oxygen and carbon(IV)oxide go through the nose, trachea and the lungs to the blood stream
what is holistic
Kibrom Reply
Holistic means encompassing the whole of a thing, and not just the part. Holistic medicine looks at the whole person for answers, not just at physical symptoms. You might have heard of holistic medicine, which tries to treat someone as mind and body, instead of treating only the part of the patient
I want to learn one by one system like skeleton system... muscular system
Mary Reply
i want to learn this
what is the difference between regional anatomy and system anatomy
system anatomy is when we study the system like digestive, circulatory, reproductive, but regional anatomy is studying the anatomy by regions of body like anatomy of neck, thorax, head etc. Regional anatomy may include system anatomy...

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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