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Figure 5: The cartoon shows how, when analysed on the basis of the extent of the pectinate muscles relative to the atrioventricular vestibules, there are only four possible ways for arrangement of two atrial appendages

Figure 5: The cartoon shows how, when analysed on the basis of the extent of the pectinate muscles relative to the atrioventricular vestibules, there are only four possible ways for arrangement of two atrial appendages