Heart: Right atrium (Latin)

Interior of the atrium dexter with its anterior wall is reflected. The facies interna of the anterior wall has a roughened appearance due to the presence of the mm. pectinati. These are folds of muscle arranged in a comb-like fashion around the region of the auricula dexter which function to act as a volume reservoir, increasing the capacity of the atrium dexter during times of dilatation. The remaining walls are smooth and offer the appreciation of several anatomical landmarks: fossa ovalis atrii dextri, valvula venae cavae inferioris, valvula sinus coronarii, as well as the ostium atrioventriculare dextrum.