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Figure 1 Ligament of Marshall: a) Gross photo showing location on posterior surface of heart: CS = coronary sinus; LAA = left atrial appendage; LOM = ligament of Marshall; PV = left superior pulmonary vein. b) Immunohistochemical staining for tyrosine hydroxylase showing positively in nerve (brown staining—arrow). M = myocardium; F = fat. (avidin-biotin-peroxidase, x120). c to e) Subserial sections showing the ligament of Marshall (LOM), isolated from the left atrial wall (in c), with 3 tracts (arrows) emerging from it (in d) and eventually inserting into the atrial wall (in e) (hematoxylin and eosin [H&E] stain x10). f) Section from lower end of LOM showing tract inserting into the left atrial wall (arrow) and coronary sinus (CS) (H&E stain x10).
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