The aortic bifurcation is the point at which the
abdominal aorta
In human anatomy, the abdominal aorta is the largest artery in the abdominal cavity. As part of the aorta, it is a direct continuation of the descending aorta (of the thorax).
Structure
The abdominal aorta begins at the level of the thoracic d ...
bifurcates (forks) into the left and right
common iliac arteries. The aortic bifurcation is usually seen at the level of
L4, just above the junction of the left and right
common iliac vein
In human anatomy, the common iliac veins are formed by the external iliac veins and internal iliac veins. The left and right common iliac veins come together in the abdomen at the level of the fifth lumbar vertebra, forming the inferior vena c ...
s.
The right common iliac artery passes in front of the left common iliac vein. In some individual, mainly women with
lumbar lordosis
Lordosis is historically defined as an ''abnormal'' inward curvature of the lumbar spine. However, the terms ''lordosis'' and ''lordotic'' are also used to refer to the normal inward curvature of the lumbar and cervical regions of the human spin ...
this vein can be compressed between the vertebra and the artery. This is the so-called
Cockett syndrome
Cockett ( cy, Y Cocyd) is a district and community (Wales), community in Swansea, Wales falling within Cockett (electoral ward), Cockett ward. It is located about north-west of Swansea city centre. It includes the eastern half of Gowerton.
Coc ...
or
May–Thurner syndrome
May–Thurner syndrome (MTS), also known as the iliac vein compression syndrome, is a condition in which compression of the common venous outflow tract of the left lower extremity may cause discomfort, swelling, pain or clots (deep venous thrombo ...
can cause a slower venous flow and the possibility of
deep venous thrombosis
Deep vein thrombosis (DVT) is a type of venous thrombosis involving the formation of a blood clot in a deep vein, most commonly in the legs or pelvis. A minority of DVTs occur in the arms. Symptoms can include pain, swelling, redness, and enla ...
in the left leg mainly in
pregnancy
Pregnancy is the time during which one or more offspring develops ( gestates) inside a woman's uterus (womb). A multiple pregnancy involves more than one offspring, such as with twins.
Pregnancy usually occurs by sexual intercourse, but ca ...
.
In surface anatomy, the bifurcation approximately corresponds to the umbilicus.
Additional images
Image:Gray531.png, The abdominal aorta
In human anatomy, the abdominal aorta is the largest artery in the abdominal cavity. As part of the aorta, it is a direct continuation of the descending aorta (of the thorax).
Structure
The abdominal aorta begins at the level of the thoracic d ...
and its branches.
Image:Gray847.png, Abdominal portion of the sympathetic trunk
The sympathetic trunks (sympathetic chain, gangliated cord) are a paired bundle of nerve fibers that run from the base of the skull to the coccyx. They are a major component of the sympathetic nervous system.
Structure
The sympathetic trunk lies j ...
, with the celiac and hypogastric plexuses.
Image:Gray1121.png, Posterior abdominal wall
In anatomy, the abdominal wall represents the boundaries of the abdominal cavity. The abdominal wall is split into the anterolateral and posterior walls.
There is a common set of layers covering and forming all the walls: the deepest being the v ...
, after removal of the peritoneum
The peritoneum is the serous membrane forming the lining of the abdominal cavity or coelom in amniotes and some invertebrates, such as annelids. It covers most of the intra-abdominal (or coelomic) organs, and is composed of a layer of mesoth ...
, showing kidneys
The kidneys are two reddish-brown bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about in length. They receive blood from the paired renal arteries; blood ...
, supra-renal capsules, and great vessels.
References
bifurcation
Bifurcation or bifurcated may refer to:
Science and technology
* Bifurcation theory, the study of sudden changes in dynamical systems
** Bifurcation, of an incompressible flow, modeled by squeeze mapping the fluid flow
* River bifurcation, the ...
Abdomen
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