Restivo A, Smith A, Wilkinson J L, Anderson R H
Institute of Child Health, University of Liverpool, Royal Liverpool Children's Hospital Alder Hey.
J Anat. 1989 Apr;163:231-42.
The morphology of the medial papillary muscle complex of the right ventricle was studied in 81 normal hearts from subjects ranging in age from 20 weeks of gestation to 13 months. The position of the main medial papillary muscle (of Lancisi) was differentiated in terms of a root and a belly. The anterior aspect of the root was found in a constant position at the basal bifurcation of the septomarginal trabeculation, whereas its belly showed considerable positional variation. Three groups of minor papillary muscles were identified and localised in specific areas in the base of the right ventricle. Taken overall, they formed part of the medial papillary complex. The complex itself was found to be constantly related to the antero-septal commissure of the tricuspid valve. A separate group of septal papillary muscles could be differentiated from the medial papillary complex. The anchorage of the septal leaflet of the tricuspid valve to the ventricular septum was also studied. The antero-superior and postero-inferior portions of this leaflet were found to be supported by the medial and posterior papillary complexes, respectively. Its midportion was connected to the septal group of papillary muscles but much variability was evident. The portion of the septomarginal trabeculation supporting the medial papillary complex, namely the postero-basal division, was studied further. This showed considerable variability and did not form a continuous anatomical spectrum.
对81例年龄从妊娠20周至13个月的正常心脏的右心室内侧乳头肌复合体形态进行了研究。主要内侧乳头肌（兰西乳头肌）的位置根据根部和肌腹进行区分。根部的前侧位于隔缘小梁基部的恒定位置，而其肌腹位置变化较大。确定了三组小乳头肌并将其定位在右心室基部的特定区域。总体而言，它们构成了内侧乳头肌复合体的一部分。发现该复合体与三尖瓣的前间隔连合始终相关。可以从内侧乳头肌复合体中区分出一组单独的间隔乳头肌。还研究了三尖瓣隔叶与室间隔的附着情况。发现该叶的前上部分和后下部分分别由内侧和后侧乳头肌复合体支撑。其中部与间隔乳头肌群相连，但变异明显。对支撑内侧乳头肌复合体的隔缘小梁部分，即后基部进行了进一步研究。结果显示其变异较大，未形成连续的解剖谱系。
