传统的观察哺乳动物心脏的实验大都采用猪心作为实验材料，但从市场采购的猪心，往往不够完整，特别是血管部分．尤其是肺静脉找不出四根，而心脏模型及挂图、课本彩图五等都标明有四根肺静脉回到左心房（即俗语所说一个心脏八个孔）。在我校同行及笔者以往的教学实践中都曾多 Most of the traditional experiments to observe the heart of mammals use pig heart as the experimental material, but pig hearts purchased from the market are often not complete, especially the blood vessels. In particular, no four can be found in the pulmonary veins, and the heart model, wall charts, textbooks, and color charts all indicate that there are four pulmonary veins returning to the left atrium (ie, one hole in the heart refers to eight holes). In my school colleagues and the author’s previous teaching practice