How does a cerebral infarction occur?

There are many causes of cerebral infarction, more common is because of atherosclerosis caused by in situ thrombosis, this time will show vascular stenosis or infarction, so that brain tissue shows ischemia, hypoxia and necrosis. There are also heart diseases, such as atrial fibrillation caused by coronary heart disease, or atrial fibrillation caused by congenital rheumatic heart disease, which are prone to cerebral embolism. There are also atrial myxomas or patent foramen ovale that can cause cerebral embolism.