Atrioventricular orifice and tricuspid valve

The tricuspid valve occupies the right atrioventricular orifice, located at the level of the right atrium floor, which connects right atrium and right ventricle. It is formed by three flaps, also called cusps. Each flap consists of a fibrous lamina coated with endocardium. The valve is characterized by two faces: the face facing upwards, looking towards the atrium, is called axial , while the face facing downwards, looking … Continue reading Atrioventricular orifice and tricuspid valve »

Atrial morphology

Right atrium We will see one by one the walls of the cardiac atrium, assimilating the latter to a cube. As such we consider 6 walls. To avoid the risk of losing ourselves, let us clarify: the upper face of the cube will be called a posterosuperior face, while the lower face is called anteroinferior face. The other faces come by themselves. Anterosuperior wall : corresponds to the sternocostal … Continue reading Atrial morphology »

Fibrous skeleton of the heart

It consists of fibrous rings (dense and regular connective tissue, a lot of collagen and few elastic fibers) that surround the valve orifices (atrioventricular orifices and orifices that host the semilunar valves) supporting the heart valves ; it also has connective formations that attack myocardial bundles . The space between these four rings is filled with a fibrous connective that forms: - right fibrous trigone placed between the aortic orifice (aortic valve) and the two … Continue reading Fibrous skeleton of the heart »

Pericardium

:: Home :: Human anatomy :: Cardio circulatory system :: Heart :: Pericardium is a thin membrane, which envelops the heart and the vascular peduncle (pulmonary trunk, superior vena cava, aorta) formed by mesothelium, or simple pavement epithelium (as peritoneum and pleura ). Two portions can be identified, namely fibrous pericardium and serous pericardium. - fibrous pericardium → membrane formed by dense connective tissue. - serous pericardium → internal membrane in turn formed by 2 sheets: - visceral leaflet: it … Continue reading Pericardium »

Myocardium

:: Home :: Human anatomy :: Cardio circulatory system :: Heart :: Common myocardium The common myocardium is formed of a fibrous skeleton with attached bundles of muscle tissue (the actual myocardium, or heart muscle). It is the intermediate tunic of the thickest heart wall. It is characterized by involuntary but striated muscle tissue (usually the smooth muscle is involuntary and the striated muscle is voluntary), it is not innervated by the nervous system but has its own conduction … Continue reading Myocardium »