Congenital Anomalies of the Heart 27 



Peacock (1846), Parker (1847), Dittrich (1852), Banks (1857), Hare 

 (1853), Peacock (i860), Heine (1861), Virchow (1861), Rauchfuss (1864), 

 Smith (1866), Hallopeau (1869), Allis (1872), Klumpke (1887), Ziegen- 

 speck (1888), Miura (1889), Preisz (1890), Lamouroux (1899), Lowen- 

 thal (1900), Schmencka (1907), Cautley (1908), Wienner (1909), Girauld 

 et Tissier (1910), Gladstone & Russmann (1915). 



2. Accessory Septum in the Left Ventricle 



Turner (1895) described a "moderator" band which arose 

 from the anterior septal wall, passed directly across the chamber 

 and was attached to the posterior wall. It does not seem that 

 this condition is analogous to the diaphragm encountered in the 

 right ventricle, more probably it is related to the anomalous cordae 

 tendinse which have been occasionally encountered. These run 

 across the ventricle in an irregular way and may be attached to 

 the semilunar valves. In some cases they form a reticular net- 

 work, suggesting a division of the ventricle into two chambers. 

 They may represent an over stimulus of the process which leads 

 to the development of the normal papilli and cordas tendinse; 

 they may be the result of a foetal endocarditis as suggested by 

 Tawara (1906). They are not incompatible with life but may 

 cause musical murmurs. 



Bouillaud (1862), Archer (1878), Bailey (1894), Rohrle (1896), Lewis 

 (1897), Marckewald (1898), Hamilton (1899), Rossle (1902), Winkler 

 (1903), Poscharessky (1904), Gallis (1904), Tawara (1906), Monckeberg 

 (1908). 



§x. 



V. IRREGULARITIES IN THE DEVELOPMENT OF 

 THE TRUNCUS COMMUNIS ARTERIOSUS 



Anomalies in this section are frequently classed with arterial 

 irregularities, but belong properly with the heart. Early in the 

 development of the heart there is a slight contracture of the tube 

 at intervals dividing it into five parts, of which the last two are 

 the bulbus cordis and the truncus arteriosus. When the heart 

 assumes an " S " shape the bulbus cordis comes to lie in front of 

 the ventricle the adjacent walls of the bulb and the ventricle fuse, 

 then disappear and the proximal part of the bulbus becomes in- 



