Ligament of Marshall
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The Ligament of Marshall (LoM) is a complex of muscle bundles, blood vessels, adipose tissue, fibrous structure, ganglia, and nerves between the left atrial appendage and the left superior pulmonary vein.[1][2] The LoM consists of the Vein of Marshall (VoM), a band of muscle called to Marshall Bundle (MB), and the epicardial ganglionated plexi.[1]
Ligament is fibrous connective tissue between bones, so "ligament" in "Ligament of Marshall" is a misnomer.