Internal anatomy of the right atrium. The interior of the right atrium has three anatomically distinct regions: (1) the posterior portion (sinus venarum) which has a smooth wall; (2) the wall of the anterior portion which is lined by horizontal, parallel ridges of muscle referred to as pectinate; and (3) the atrial septum. IVC=inferior vena cava; SA=sinoatrial; SVC=superior vena cava
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