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Lateral arcuate ligament
Thoracic cavity muscle From Wikipedia, the free encyclopedia
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The lateral arcuate ligament (also lateral lumbocostal arch and external arcuate ligament) is a ligament under the diaphragm that arches across the upper part of the quadratus lumborum muscle. It is traversed by the subcostal nerve, artery and vein.
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Structure
The lateral arcuate ligament runs from the front of the transverse process of the first lumbar vertebra, and, laterally, to the tip and lower margin of the twelfth rib.[1] It forms an arch over the quadratus lumborum muscle.[1]
Variations
The lateral arcuate ligament is commonly described in anatomy textbooks as attaching at the first lumbar vertebra (L1).[2] However, other instances have been found in cadaver studies with attachments at either the second (L2) or third (L3) lumbar vertebra.[2]
In around 5% of people, inferolateral extensions of the lateral arcuate ligaments, such as thickened nodular areas, are found adjacent to the lateral diaphragmatic surface which can be visualized with computed tomography (CT) scans.[3]
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History
The lateral arcuate ligaments were described by Galen, as early as AD 177.[4][5] This was found in his animal dissections performed as part of his Rome lectures, collected in De Anatomicus Administrationibus.[4][5]
See also
References
External links
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