title: Transmitter-related retrograde labeling in the pigeon optic lobe: a high resolution autoradiographic study.
abstract: High resolution light microscopic and electron microscopic autoradiography in a restricted area of the pigeon subtectal nucleus isthmi, pars parvocellularis (Ipc) 30 min after onset of a tectal [3H]glycine injection shows labeling mainly of the following elements: neuronal perikarya, initial axon segments and dendrites. Rapid labeling of such intrinsic Ipc elements and not of synaptic terminals possibly of tectal origin strongly suggests a fast retrograde migration of radioactivity within Ipc-tectal neurons. Fixation experiments indicate a soluble nature of this radioactive material. This type of retrograde labeling in the glycinergic Ipc-tectal pathway seems to be related to the transmitter specificity of the system.
mesh_terms: D000818:Animals; D001345:Autoradiography; D001370:Axonal Transport; D001369:Axons / Q000648:ultrastructure; D010856:Columbidae; D003712:Dendrites / Q000648:ultrastructure; D005998:Glycine / Q000378:metabolism*; D009413:Nerve Fibers, Myelinated / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D009899:Optic Lobe, Nonmammalian / Q000033:anatomy & histology*; D013569:Synapses / Q000648:ultrastructure
chemical_list: D005998:Glycine