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Figure 5: (a) Frontal section of a 25-week heart showing the morphologically LV always develops together with the mitral valve. Note the mitroaortic continuity. (b) Sagittal section of a 28-week fetal heart showing the three components of the LV: the inlet (mitral valve), apical trabecular, and LV outflow tract which is in anatomic relation of the pulmonary valve. (c) Histological section of the outlet of the LV stained with Masson trichrome of 25-week. The two sinuses of the aortic root supporting the coronary arteries are sustained by the left ventricular myocardium. (d) Histological section of 23-week fetal heart. The thin membranous septum separates the cavities of the right and LVs. Ao: Aorta, E: Esophagus, CS: Coronary sinus, IVS: Interventricular septum, LA: Left atrium, LAA: Left atrial appendage, LCx: Left circumflex artery, LV: Left ventricle, LSPV: Left superior pulmonary vein, MV: Mitral valve, MS: Membranous septum, OF: Oval fossa, RA: Right atrium, RCA: Right coronary artery, RSPV: Right superior pulmonary vein, RV: Right ventricle, SCV: Superior caval vein, TC: Terminal crest, TV: Tricuspid valve

Figure 5: (a) Frontal section of a 25-week heart showing the morphologically LV always develops together with the mitral valve. Note the mitroaortic continuity. (b) Sagittal section of a 28-week fetal heart showing the three components of the LV: the inlet (mitral valve), apical trabecular, and LV outflow tract which is in anatomic relation of the pulmonary valve. (c) Histological section of the outlet of the LV stained with Masson trichrome of 25-week. The two sinuses of the aortic root supporting the coronary arteries are sustained by the left ventricular myocardium. (d) Histological section of 23-week fetal heart. The thin membranous septum separates the cavities of the right and LVs. Ao: Aorta, E: Esophagus, CS: Coronary sinus, IVS: Interventricular septum, LA: Left atrium, LAA: Left atrial appendage, LCx: Left circumflex artery, LV: Left ventricle, LSPV: Left superior pulmonary vein, MV: Mitral valve, MS: Membranous septum, OF: Oval fossa, RA: Right atrium, RCA: Right coronary artery, RSPV: Right superior pulmonary vein, RV: Right ventricle, SCV: Superior caval vein, TC: Terminal crest, TV: Tricuspid valve