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| Lumbar arteries | |
|---|---|
| Name | Lumbar arteries |
| Latin | arteriae lumbales |
| Source | dorsal aorta |
| Supplies | posterior abdominal wall, spinal cord, vertebrae, skin, muscles |
Lumbar arteries are paired segmental arteries arising from the posterior aspect of the abdominal aorta that supply the posterior abdominal wall, vertebral elements, and portions of the spinal cord. They form anastomoses with branches of the iliolumbar artery, deep circumflex iliac artery, and the intercostal arteries, contributing to collateral circulation relevant in aortic surgery, spinal procedures, and trauma care. Their predictable segmental pattern underpins approaches in vascular surgery, neurosurgery, and interventional radiology.
The lumbar arteries typically arise from the posterior surface of the Abdominal aorta at the level of the L1 vertebra, L2 vertebra, L3 vertebra, L4 vertebra and L5 vertebra, running laterally posterior to the Psoas major muscle and anterior to the Quadratus lumborum muscle. Each artery gives off dorsal branches that penetrate the posterior abdominal wall and spinal canal via the intervertebral foramina to supply the dorsal elements of the Spinal cord, the vertebral bodies, the meninges, and the overlying skin and musculature such as the Erector spinae group. The most superior lumbar arteries often have close relations to the origin of the Inferior mesenteric artery and the inferior-most may lie near the bifurcation of the aorta adjacent to the Common iliac artery and the Inferior vena cava.
Branches include muscular, dorsal (spinal) and meningeal branches; muscular branches feed the Psoas major muscle, Quadratus lumborum muscle, and posterior abdominal wall muscles, while dorsal branches enter the spinal canal supplying the Spinal nerve roots, vertebral periosteum, and the meninges. Anatomical variations are common: the number and origin level of lumbar arteries may vary with congenital anomalies of the aorta such as a high origin of the Renal artery or presence of a Duplicated inferior vena cava. Accessory or absent lumbar arteries have been documented in association with anomalous development of the Median sacral artery and collateralization from the Superior mesenteric artery in cases of occlusive disease of the abdominal aorta. Such variations affect planning for procedures involving the Abdominal aorta, Endovascular aneurysm repair, and retroperitoneal approaches described in surgical atlases by institutions like Mayo Clinic and Johns Hopkins Hospital.
Embryologically, lumbar arteries develop from the dorsal branches of the paired dorsal aortae during somitic vascularization in the fourth to eighth weeks of development, coordinated with the segmentation of paraxial mesoderm into Somites and differentiation influenced by morphogens studied in models like Xenopus laevis and Danio rerio. Their pattern reflects the segmental organization imposed by the developing spinal nerves and vertebrae; disruptions in vascular patterning genes and signaling pathways investigated at research centers such as the Max Planck Institute and Howard Hughes Medical Institute laboratories can produce malformations, while evolutionary comparisons reference taxa in the Mammalia clade for conserved arterial arrangements.
Lumbar arteries contribute to the arterial supply of posterior abdominal wall structures, vertebral bodies, spinal meninges, and portions of the spinal cord via radicular branches; they help maintain spinal perfusion particularly through anastomoses with the posterior intercostal arteries and the Artery of Adamkiewicz when present. In physiological states involving increased collateral demand—such as in chronic aortic occlusive disease described in classic vascular surgery literature from Cleveland Clinic—the lumbar arteries enlarge to provide collateral flow between the thoracic and pelvic circulations, interacting with branches from the Internal iliac artery and the deep pelvic plexuses investigated by neuroanatomists at institutions like Columbia University.
Injury to or ligation of lumbar arteries can result in hemorrhage, retroperitoneal hematoma, or compromised spinal cord perfusion leading to ischemic myelopathy; such complications are discussed in case series from tertiary centers including Massachusetts General Hospital. The lumbar arteries are relevant in the pathogenesis and treatment of conditions such as spontaneous retroperitoneal bleeding in anticoagulated patients, arteriovenous malformations of the spine treated by teams at Mayo Clinic, and in planning for tumor resections involving metastatic lesions of the vertebral bodies described in oncology reviews from Memorial Sloan Kettering Cancer Center. Iatrogenic injury can occur during lumbar disk surgery, retroperitoneal lymphadenectomy performed in the management of testicular cancer per protocols from The Royal Marsden Hospital, and during placement of lumbar pedicle screws in spinal fusion carried out in centers like Barrow Neurological Institute.
Preoperative imaging with computed tomography angiography (CTA), magnetic resonance angiography (MRA), or digital subtraction angiography (DSA) is recommended to delineate lumbar artery anatomy and variations prior to interventions such as endovascular aneurysm repair (EVAR), spinal decompressions, or tumor embolization referenced in guidelines from societies like the Society for Vascular Surgery and North American Spine Society. Interventional radiology techniques can selectively embolize lumbar arteries to control hemorrhage or devascularize vertebral tumors, with procedural outcomes reported by groups at Stanford University and UCLA Medical Center. During open aortic surgery and thoracoabdominal aneurysm repair described in surgical texts from Cleveland Clinic and Johns Hopkins Hospital, preservation or reimplantation of critical lumbar or intercostal arteries may be considered to reduce the risk of spinal cord ischemia, often guided by intraoperative neuromonitoring protocols developed at neurophysiology labs such as those at Toronto General Hospital.
Category:Arteries of the abdomen