... neurons are found(Fig. 1A) , a smaller number of these neurons arescattered in the pontine raphe nucleus, the periaqu-eductal gray matter, and the area dorsal to the substantia nigra in the ... in the brain and testis. In rodent brain, ana-tomical studies have revealed its predominant expression in neurons of the nucleus incertus of the dorsal pons, and a few other regions of the brain-stem. ... neurons of the NI, the function of this peptide has been assessed basedupon anatomical studies of the NI at the neuronal level[14,15]. The NI is composed of two subdivisions, the pars compacta...