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小冠状动脉是指直径0.1至1毫米的小动脉。直径小于100微米的小动脉则称为细动脉。小冠状动脉有两种类型。通过彩色塑料制成的冠状血管造型可显示由左心室动脉分出的小冠状动脉的大小和分布情况。一种直径约200微米的小冠状动脉从心外膜下穿过心肌直到心内膜,很少或不再分枝,仅在到达心内膜时才形成少数细小的分枝。另一种小冠状动脉比前者稍粗,直径约300至400微米,在心外膜下很快分成两枝。其中一枝分布于心外膜下,另一枝穿过心肌又分成许多小枝进入心内膜。小冠状动脉病变的类别 (1) 纤维肌肉结构不良(fibromusculardysplasia) 小冠状动脉的纤维肌肉结构不
Small coronary arteries refer to arterioles 0.1 to 1 mm in diameter. Arterioles less than 100 microns in diameter are called arterioles. There are two types of small coronary arteries. Coronary vessels made of colored plastic can show the size and distribution of small coronary arteries separated from the left ventricular artery. A small coronary arteries approximately 200 microns in diameter traverse the epicardium through the myocardium up to the endocardium with little or no branching and only form a few fine branches upon reaching the endocardium. Another small coronary artery slightly thicker than the former, a diameter of about 300 to 400 microns, the epicardial quickly divided into two branches. One branch is located in the epicardial, the other branches through the myocardium is divided into many branches into the endocardium. Types of Small Coronary Artery Lesions (1) Fibromuscular dysplasia Fibromuscular structures of small coronary arteries