Involvement of the periaqueductal grey matter and spinal 5-hydroxytryptaminergic pathways in morphine analgesia: effcts of lesions and 5-hydroxytryptamine depletion.

Involvement of the periaqueductal grey matter and spinal 5-hydroxytryptaminergic pathways in morphine analgesia: effcts of lesions and 5-hydroxytryptamine depletion.