Medial arcuate ligament

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Medial arcuate ligament
The diaphragm. Under surface. (Med. arcuate ligament visible at bottom center left.)
Latin ligamentum arcuatum mediale
Gray's subject #117 404
Dorlands/Elsevier l_09/12491643

The medial arcuate ligament (also medial lumbocostal arch) is tendinous fascia that arches over the psoas major muscle as it passes through the diaphragm.


The medial arcuate ligament is an arch in the fascia covering the upper part of the psoas major. It is attached to the side of the body of the first or second lumbar vertebra; laterally, it is fixed to the front of the transverse process of the first and, sometimes also, to that of the second lumbar vertebra.

It lies between the lateral arcuate ligament and the midline median arcuate ligament.

See also

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.