Yijian: apex of heart

bottom: bottom of heart

Two sides: thoracic and rib surface, diaphragmatic surface (flatter)

Three edges: The left edge is blunt and not obvious, and the right edge is the dividing line between the rib surface and the base of the heart. The lower edge is the dividing line between the thoracic and rib surfaces and the diaphragmatic surface, which is close to horizontal

Four grooves: ① Coronary sulcus, the boundary between the atrium and the ventricle ② Anterior interventricular groove, the coronal sulcus on the thoracic and costal surface down to the apex of the heart, with an apical notch ③ Posterior interventricular groove, the coronal sulcus on the diaphragm surface down to the apical notch, left and right The boundary between the ventricles ④ the posterior interatrial groove and the boundary between the left and right atria. The intersection of the posterior interventricular sulcus, posterior interventricular sulcus, and coronal sulcus is called the atrioventricular node

The weakest part of the interatrial septum is called the fossa ovale

interventricular septum

Right atrium: The opening between the ventricular orifice of the right atrium and the inferior vena cava is the coronary sinus ostium

Right ventricle: The arcuate muscle bulge between the right atrioventricular orifice and the pulmonary artery orifice is called the supraventricular ridge There are three tricuspid valves surrounding the right atrioventricular orifice.

Left atrium: There are two pulmonary vein openings on each side

Left ventricle: There are two valves around the mouth of the left atrium and ventricle, namely the mitral valve. The left ventricular outlet is the aortic orifice

Sinoatrial node: the normal pacemaker of the heart

atrioventricular bundle

atrioventricular node

artery

vein