Projections from the lateral division of the lateral posterior-pulvinar complex to area 21a and the striate cortex in the cat.
The axonal tracer HRP-WGA, injected into area 21a of the cat, was used in conjunction with AChE histochemistry to demonstrate that a reciprocal pathway links area 21a with the LPl (striate recipient zone) in the lateral posterior-pulvinar complex. Separate injections of the fluorescent tracers, Fast blue (FB) and Diamidino yellow (DY), were then placed simultaneously in the striate cortex and area 21a, respectively, to identify the relative position of cells projecting to both cortical areas and to pinpoint the location of efferent terminals in the LPl. Both FB and DY labelled cells and terminals are located together in the LPl but none of the neurons projecting to the striate cortex and area 21a was double labelled which would have indicated the presence of cells with axons projecting to both areas. Nonetheless, the intermingling of cells projecting to the striate cortex and area 21a, and the reciprocal character of both pathways, is consistent with a model in which the two cortical areas exchange signals via the LPl.
Wimborne
B M
BM
Centre for Visual Science, John Curtin School of Medical Research, Australian National University, Canberra.
McCart
R J
RJ
Henry
G H
GH
D000110:Acetylcholinesterase / Q000032:analysis; D000578:Amidines; D000818:Animals; D001370:Axonal Transport; D002415:Cats / Q000033:anatomy & histology*; D005456:Fluorescent Dyes; D006651:Histocytochemistry; D006735:Horseradish Peroxidase; D013788:Thalamus / Q000033:anatomy & histology* / Q000166:cytology / Q000201:enzymology; D014793:Visual Cortex / Q000033:anatomy & histology* / Q000166:cytology / Q000201:enzymology; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D014909:Wheat Germ Agglutinins
D000578:Amidines; D005456:Fluorescent Dyes; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D014909:Wheat Germ Agglutinins; C031455:diamidino compound 253-50; C037945:diamidino yellow; D006735:Horseradish Peroxidase; D000110:Acetylcholinesterase