Objective To observe the morphological characteristics of the atrioventricular conduction axis in fresh porcine heart by the microdissection and histological methods. Methods The anatomical data of the porcine cardiac atrioventricular conduction axis was observed, explored and measured by dissecting 30 cases of fresh porcine hearts under stereomicroscope, and their histological data were observed and analyzed by the conventional HE and Masson's staining techniques. Results The atrioventricular conduction axis was successfully detected in 22 of 30 porcine hearts, and it was found that the proximal portion of left bundle branch was arranged in fascicular, and the distal portion was flared. The capsules of his bundle, left bundle branch, and right bundle branch of porcine heart were relatively thick and easy to identify with the naked eye. The width of the atrioventricular bundle (AVB), the length of AVB, the proximal width of the left bundle branch were (1.58±0.75) mm, (17.56±7.79) mm, (2.40±1.11) mm, respectively, and the angle between the left bundle branch and the AV bundle was (114.46±13.06)°. Conclusions The position and morphological feature of AVB, left bundle branch and right bundle branch in pigs may be slightly different from other animals.
Key words
Cardiac conduction system /
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Stereomicroscope /
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Porcine heart /
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Anatomy
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