convex	flat	concave

Fig. 1.6.34. Synaptic curvature was supposed to represent a morphological expression of synaptic plasticity. Examples of convex (also known as positively curved or "frown"), flat, and concave (also known as negatively curved, U-shaped, or "smile") curvature are shown. (Human, mouse, neocortex. Rat, hippocampus.)

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