Ultrastructural appearances of the spinal microvasculature between 12 hours and 5 days after impact injury

摘要: The ultrastructural appearance of the spinal microvasculature was studied from 12 h to 5 days after an impact injury. At many vessels were normal but astrocytic swelling and protein extravasation common with greater impacts, more contained cell aggregates. Neutrophils in perivascular spaces (PVS). 48 hours cytoplasm some endothelial cells “watery” swollen vesico-tubular profiles. Other pericytes numerous free ribosomes, increased rough endoplasmic reticulum (RER) occasional lipid inclusions. By 3 PVS reactive number both attached. Most these probably derived circulating monocytes. there a decrease ribosomal numbers compared those seen earlier vesicles, Golgi apparatus multivesicular bodies prominent. macrophages fibroblasts. From 49 small cells, basement membranes one or rudimentary lumina found. Occasional cell/basement membrane profiles no encountered. These various structures are thought represent regenerating new vessels.