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MIND AS A TISSUE

This volume is a short monograph reporting an intensive and detailed study of the occurrence of myocardial bridges over the coronary arteries. These are normal anatomical structures which have been seen by all who dissect the coronary arteries carefully. The name, which is frequently in this monograph extended to 'muscular overbridgings', applies to areas in which the main coronary vessels run through superficial tunnels in which a leaf of myocardium passes between the artery and the epicardium in a part of its course which is usually extra-myocardial. These biidges have been observed in 85-7y% of the hearts dissected. Their distribution has been analysed in relation to sex and various other variables and a study has been added of the occurrence of the bridges in a wide variety of animals. No direct relationship has been established with myocardial infarction but it is suggested that there is some increased predilection to atherosclerotic processes close to the bridges. The authors are to be congratulated on such a detailed study which has finally disposed of the idea that these anatomical variations have pathological significance. T. CRAWFORD