AIM
To study the distribution of NADPH-diaphorase positive neurons in periaqueductal gray matter(PAG) and dorsal raphe nucleus (DR), and the correlation between nitric oxide and peripheral nociception at supraspinal level.
METHODS
20 Sprague-Dawley rats were randomly divided into two groups. In experimental group (n = 10), formalin (5%, 0.1 ml) was… (More)