title: Laminar origins of spinal projection neurons to the periaqueductal gray of the rat.
abstract: Attempts were made to determine the cells of origin of the spinal projections to the PAG using retrograde axoplasmic transport techniques of HRP and fluorescent markers. Following injections limited to the lateroventral subnucleus of the PAG, labels were transported to the contralateral laminae I, III, V, VII and X primarily. A striking number of labeled neurons were found in the lumbosacral region. Discussion followed on the possible dichotomic axonal projections of the labeled spinal neurons.
mesh_terms: D000344:Afferent Pathways / Q000502:physiology; D000818:Animals; D001370:Axonal Transport; D001921:Brain / Q000033:anatomy & histology / Q000502:physiology*; D005456:Fluorescent Dyes; D009474:Neurons / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D013116:Spinal Cord / Q000502:physiology*
chemical_list: D005456:Fluorescent Dyes