Efferent projections of the pigeon intergeniculate leaflet containing neuropeptide Y.
The present study was preformed to map efferent projections of the pigeon intergeniculate leaflet (IGL) to other visual structures, with emphasis on the pathways containing neuropeptide Y (NPY). After injections of an anterograde tracer (Phaseolus vulgaris leucoagglutinin) into the IGL, labeled axons and presumptive terminals were seen in several retinorecipient and visually-related nuclei. All such areas contained immunoreactive fibers to antibodies against NPY. Electrolytic lesion of the IGL provoked a marked reduction in the number of NPY-labeled fibers in these visual structures. The data suggest that the IGL is the source of NPY-labeled axons which occur in many visual nuclei of the pigeon brain.
Hamassaki
D E
DE
Departamento de Fisiologia e Biofísica, Universidade de São Paulo, Brasil.
Britto
L R
LR
D000818:Animals; D001931:Brain Mapping; D010856:Columbidae; D005829:Geniculate Bodies / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D009478:Neuropeptide Y / Q000378:metabolism*; D010835:Phytohemagglutinins / Q000494:pharmacology*; D014795:Visual Pathways / Q000502:physiology*
D009478:Neuropeptide Y; D010835:Phytohemagglutinins; C100156:leukoagglutinins, plants