Ugarte M, Enríquez de Salamanca F, Quero M
Br Heart J. 1976 Jul;38(7):674-82. doi: 10.1136/hrt.38.7.674.
An anatomical study of 54 specimens with endocardial cushion defect is described. The material was divided into two groups, according to the morphology and attachments of the anterior component of the anteroseptal mitral leaflet. We suggest that there is no divided or undivided anterior common leaflet. There are always two anterior leaflets, a mitral and a tricuspid one, separated by a commissure; depending on the degree of straddling of the mitral component over the interventricular septum, this will protrude into the interventricular septum or into the anterior papillary muscle of the right ventricle. Thus, the commissure separating the mitral and the tricuspid components will lie over the interventricular septum or will be quite separate in the right ventricle. In the latter case the straddling mitral component gives the false appearance of an undivided anterior common leaflet. The septal tricuspid leaflet was found to be underdeveloped or absent but we were not able to find any clefts or divisions in it. We suggest that this leaflet derives solely from the division of the posteroinferior endocardial cushion into two halves, right and left. The left half later becomes the posterior component of the normal anteroseptal mitral leaflet. Associated anamalies are also reviewed.
本文描述了对54例心内膜垫缺损标本的解剖学研究。根据前间隔二尖瓣叶前部成分的形态和附着情况，将材料分为两组。我们认为不存在分裂或未分裂的前共同叶。总是有两个前叶，一个二尖瓣叶和一个三尖瓣叶，由一个连合分开；根据二尖瓣成分跨室间隔的程度，它会突入室间隔或右心室的前乳头肌。因此，分隔二尖瓣和三尖瓣成分的连合将位于室间隔上方或在右心室内完全分开。在后一种情况下，跨隔的二尖瓣成分会给人一种未分裂的前共同叶的假象。发现隔侧三尖瓣叶发育不全或缺失，但我们在其中未发现任何裂隙或分裂。我们认为该叶仅源自后下的心内膜垫分为左右两半。左半部分后来成为正常前间隔二尖瓣叶的后部成分。还对相关异常情况进行了综述。
