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. 2015 Jan 9;4(1):2047981614562443. doi: 10.1177/2047981614562443

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Fig. 5. — An illustration shows the embryologic development of the left atrium. A primitive pulmonary vein opens into the primitive left atrium then the pulmonary vein divides into four pulmonary veins. A part of the pulmonary vein becomes a smooth-walled part of the left atrium (blue). The primitive left atrium (the trabeculated part with patterned pink background) becomes left atrial appendage. EC, endocardial cushion; LA, left atrium; LAA, left atrial appendage; PV, pulmonary vein. This illustration was modified with permission from: Moore KL, Persaud TVN. The Developing Human: Clincially Orientated Embryology. 8th edition. Amsterdam: Elsevier, 2008:303.