Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== RIGHT ATRIUM ====== * Atrium dextrum - Right atrium * right atrium * External features * little ear or right auricle * covers the root of ascending aorta * partly overlaps the infundibulum of right ventricle * margins are notched and interior is sponge like * right border of atrium * along this border * shallow vertical groove * passes from SVC to IVC * sulcus terminalis ( corner sulcus ) * upper part contains SA node * Caused by * internal muscular ridge * crista terminalis ( corner line ) * right atrioventricular groove * separates * right atrium from the right ventricle * more or less vertical * lodges right coronary artery * small cardiac vein * Internal features * smooth posterior part or sinus venarum * most of tributaries except anterior cardiac vein drain in to it * superior venacava opens at upper end * inferior venacava opens at lower end * guarded by rudimentary valve * eustachian valve (gate ) * in embryonic life * directs IVC blood to left atrium * coronary sinus ( heart tank ) * opens between * IVC opening and Right atrioventricular orifice * guarded by thebesian valve * venae cordis minimae ( small heart veins) * present in walls of all 4 chambers * open in to right atrium * derived from right horn of sinus venosus * intervenous tubercle of lower * posterior wall of atrium * rough anterior part or pectinate part * derived from primitive artrial chamber * series of transverse muscular ridges * called musculi pectinati * interatrial septum * derived from septum primum and septum secundum * fossa ovalis * annulus ovalis or limbus fossa ovalis {{:anatomy:atrium-right.png}} en/right_atrium.txt Last modified: 2024/08/30 11:30by 127.0.0.1