Lumbar arteries
Encyclopedia
The lumbar arteries are in parallel with the intercostals
.
They are usually four in number on either side, and arise from the back of the aorta
, opposite the bodies of the upper four lumbar vertebræ.
A fifth pair, small in size, is occasionally present: they arise from the middle sacral artery.
They run lateralward and backward on the bodies of the lumbar vertebræ, behind the sympathetic trunk
, to the intervals between the adjacent transverse processes, and are then continued into the abdominal wall.
The arteries of the right side pass behind the inferior vena cava
, and the upper two on each side run behind the corresponding crus
of the diaphragm.
The arteries of both sides pass beneath the tendinous arches which give origin to the Psoas major, and are then continued behind this muscle and the lumbar plexus.
They now cross the Quadratus lumborum, the upper three arteries running behind, the last usually in front of the muscle.
At the lateral border of the Quadratus lumborum they pierce the posterior aponeurosis of the Transversus abdominis and are carried forward between this muscle and the Obliquus internus.
They anastomose with the lower intercostal, the subcostal
, the iliolumbar
, the deep iliac circumflex, and the inferior epigastric arteries.
Intercostal arteries
The intercostal arteries are a group of arteries that supply the area between the ribs , called the intercostal space.* Highest intercostal artery - first and second intercostal spaces...
.
They are usually four in number on either side, and arise from the back of the aorta
Aorta
The aorta is the largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, where it branches off into two smaller arteries...
, opposite the bodies of the upper four lumbar vertebræ.
A fifth pair, small in size, is occasionally present: they arise from the middle sacral artery.
They run lateralward and backward on the bodies of the lumbar vertebræ, behind the sympathetic trunk
Sympathetic trunk
The sympathetic trunks are a paired bundle of nerve fibers that run from the base of the skull to the coccyx.-Structure:...
, to the intervals between the adjacent transverse processes, and are then continued into the abdominal wall.
The arteries of the right side pass behind the inferior vena cava
Inferior vena cava
The inferior vena cava , also known as the posterior vena cava, is the large vein that carries de-oxygenated blood from the lower half of the body into the right atrium of the heart....
, and the upper two on each side run behind the corresponding crus
Crus of diaphragm
The crura of the diaphragm are tendinous structures that extend inferiorly from the diaphragm to attach to the vertebral column...
of the diaphragm.
The arteries of both sides pass beneath the tendinous arches which give origin to the Psoas major, and are then continued behind this muscle and the lumbar plexus.
They now cross the Quadratus lumborum, the upper three arteries running behind, the last usually in front of the muscle.
At the lateral border of the Quadratus lumborum they pierce the posterior aponeurosis of the Transversus abdominis and are carried forward between this muscle and the Obliquus internus.
They anastomose with the lower intercostal, the subcostal
Subcostal arteries
The subcostal arteries, so named because they lie below the last ribs, constitute the lowest pair of branches derived from the thoracic aorta, and are in series with the intercostal arteries....
, the iliolumbar
Iliolumbar artery
The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery.-Course:The iliolumbar artery turns upward behind the obturator nerve and the external iliac artery and vein, to the medial border of the psoas major, behind which it divides into:* Lumbar branch of...
, the deep iliac circumflex, and the inferior epigastric arteries.