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Model Of The Superficial Anatomy Of The Heart Of An Adult Human Body Posterior Oblique View. The Heart Contains Four Cavities: Two Atriums In Its Upper Part, And Two Ventricles In Its Lower Part. The Ventricles In Light Orange Have Superficial Grooves The Sulci, In Amber Yellow, That Contains Fat And The Coronary Circulation, Feeding The Heart Muscle. At The Boundary Between The Atriums And The Ventricles, The Coronary Sulcus Receives The Coronary Sinus Left Half Of The Heart And The Small Cardiac Vein Right Half Of The Heart, In Royal Blue; It Also Contains The Right Coronary Artery In Red. The Left Ventricle Surface Is Irrigated By The Posterior Vein Of Left Ventricle In Royal Blue And A Posterior Left Ventricular Branch, Coming From The Circumflex Branch Of Left Coronary Artery In Red. In The Posterior Interventricular Sulcus, Which Marks The Boundary Between Both Ventricles, Lie The Middle Cardiac Vein In Royal Blue And The Posterior Interventricular Branch Of Right Coronary Artery In Red. Through The Inferior Vena Cava, The Right Atrium Receives The Deoxygenated Blood Coming From The Lower Part Of The Body. The Blood Oxygenated By The Lungs Is Sent Back To The Left Atrium Via Four Pulmonary Veins, Of Which Two Are Visible Here: The Right And Left Inferior Pulmonary Veins. The Upper Aorta In Red, Trachea Cartilaginous Rings In Light Blue And Esophagus In Reddish Brown Segments Are Visible On The Left Part Of The Picture. (Photo By BSIP/UIG Via Getty Images)