Fig. 2

Histopathological changes in hippocampus tissues of rats in each group were observed by HE staining. The hippocampus tissues of CUS and cardiac surgery rats, at fivefold magnification (a) and at 20 fold magnification (d) after HE staining, the black arrow indicates the degenerative neurons. The hippocampus tissues of cardiac surgery rats, at fivefold magnification (b) and at 20 fold magnification (e) after HE staining, the black arrow indicates the degenerative neurons. The hippocampus tissues of normal rats, at fivefold magnification (c) and at 20 fold magnification (f) after HE staining