Relationship between right ventricular muscle bundles and pulmonary valve. Significance in pulmonary atresia with intact ventricular septum.
The normal pulmonary valvular cusps and related sinuses lie superimposed upon specific muscle bundles of the right ventricular infundibulum. Most prominent of such muscle bundles are those related to the right and left (posterior) pulmonary valvular cusps and sinuses. Least prominent is the muscle bundle related to the anterior pulmonary cusp and sinus. In pulmonary valvular atresia with intact septum the normal relationships are accentuated by right ventricular hypertrophy. A transpulmonary valvotomy done either through the region of the right or left (posterior) cusp tends to extend through subjacent muscle. The opening made through the region of the anterior cusp is more apt to lead directly into the right ventricular cavity.
D006332:Cardiomegaly / Q000473:pathology; D006321:Heart / Q000033:anatomy & histology; D006346:Heart Septum; D006352:Heart Ventricles / Q000473:pathology; D006801:Humans; D009206:Myocardium / Q000473:pathology*; D010210:Papillary Muscles / Q000473:pathology; D011664:Pulmonary Valve / Q000002:abnormalities* / Q000473:pathology / Q000601:surgery