Morphology of injury at 24 hours and 1 week.

<p>Methylene blue stained semi-thin sections (0.5 µm) of spinal cords at 24 hours (<b>A</b>) and 1 week (<b>B</b>) after injury, from 5 mm rostral (+) to 5 mm caudal (−) of the centre of the injury site. At 24 hours damage was apparent within 2 to 3 mm of the centre of the injury site in both grey and white matter. No macrophages were visible in the tissue. At 1 week tissue was being cleared by numerous macrophages (*) that had infiltrated the tissue and the early stages of cyst formation can been seen at the centre of the injury. Scale bars are 1 mm.