Ligament of Marshall

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. The LoM consists of the Vein of Marshall (VoM), a band of muscle called to Marshall Bundle (MB), and the epicardial ganglionated plexi.

Ligament is fibrous connective tissue between bones, so "ligament" in "Ligament of Marshall" is a misnomer.