Effect of Chronic Morphine Consumption on Synaptic Plasticity of Rat’s Hippocampus: A Transmission Electron Microscopy Study

Table 2

The changes of synaptic curvature (SCZ) between the three groups (morphine, placebo, and control groups).

Groups	Synaptic curvatures
	𝑁	Convex form	Concave form	Flat (no changes)	𝑃
Morphine	8	87.5%	12.5%	0%	𝑃 < 0.0070
Placebo (sucrose)	8	19.5%	39%	41.5%
Control	8	12.5%	45%	42.5%