Objective To observe the morphologic characteristics of myocardial sleeve in sheep~(, ) s pulmonary veins to provide data for the model of ectopic atrial fibrillation.
目的观察山羊肺静脉心肌袖的形态特征，为异位房颤动物模型提供形态资料。
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To study the morphologic changes of dopaminergic neurons in VTA and SN in the dementia model group, control group and the old group, and to analyse the result concluded by image analysing system.
Conclusions:This model may be applied for the study of morphologic characteristics and changes induced by growth, orthodontic treatment and orthognathic operation on middle sagittal plane.