Ultrastructurally, the outer membrane consisted of bundles of collagen fibrils and cellular elements such as fibroblasts, mast cells, migrating erythrocytes, platelets and eoslnophils.

• 在电镜下血肿外膜可见成束状之胶原纤维及一些细胞成份如纤维织母细胞、肥大细胞、移动性红血球、血小板及嗜伊红细胞。