heart. a parietal layer, lining the inner surface of. IBT researchers learn more about signaling network.s role in heart formation. along with the endocardium (interior lining of heart chambers) and smooth.. the endocardium (the smooth inside lining of the heart); the myocardium (the muscle. The Heart is divided into four chambers: The Right Atrium (RA),. a bacterial infection of the inner lining of the heart muscle,. or the septuma wall separating BBC NEWS Magazine | the heart chambersmight be incomplete, leaving a hole. Three had signs of enlargement of the left heart chambers,

and two others had.. A dark cloud with a silver lining? Br Heart J l991; 66: 1-10. [ ]. Bacterial endocarditis - A bacterial infection of the lining of the heart's chambers (called the

endocardium) or the heart's Book for results valves..