The collagenous fibers in pericardium consisted of superficial collagen layer,light layer, deep collagen layer and reticular layer, and it runs in fuor ways including up-down orientation,left-right orientation,obligue orientation and vertical orientation.

• 心外膜的胶原纤维分为浅胶原层、亮层、深胶原层和网状层 ,其走向包括上下、左右、斜行和垂直 4种走向。