A comparison of the organization of the projections of the dorsal lateral geniculate nucleus, the inferior pulvinar and adjacent lateral pulvinar to primary visual cortex (area 17) in the macaque monkey

1979 ◽  
Vol 167 (1) ◽  
pp. 19-40 ◽  
Author(s):  
Michael Rezak ◽  
L.A. Benevento
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Macaque Monkey ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Area 17 ◽  
Lateral Geniculate ◽  
Cortex Area ◽  
Dorsal Lateral Geniculate

Numerical relationship between neurons in the lateral geniculate nucleus and primary visual cortex in macaque monkeys

1996 ◽  
Vol 13 (3) ◽  
pp. 585-590 ◽  
Author(s):  
Ivan Suner ◽  
Pasko Rakic
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Rhesus Monkeys ◽  
Three Dimensional ◽  
Area 17 ◽  
Counting Method ◽  
Lateral Geniculate ◽  
Cortex Area ◽  
The Right

AbstractWe examined the numerical correlation between total populations of neurons in the lateral geniculate nucleus (LGN) and the primary visual cortex (area 17 of Brodmann) in ten cerebral hemispheres of five normal rhesus monkeys using an unbiased three-dimensional counting method. There were 1.4 ± 0.2 million and 341 ±54 million neurons in the LGN and area 17, respectively. In each animal, a larger LGN on one side was in register with a larger area 17 of the cortex on the same side. Furthermore, asymmetry in the number of neurons in both the LGN and area 17 favored the right side. However, because of small variations across subjects, correlation between the total neuron number in LGN and area 17 was weak (r = 0.29). These results suggest that the final numbers of neurons in these visual centers may be established independently or by multiple factors controlling elimination of initially overproduced neurons.

scholarly journals Extrastriate Connectivity of the Mouse Dorsal Lateral Geniculate Thalamus

2018 ◽  
Author(s):  
Michael S. Bienkowski ◽  
Nora L. Benavidez ◽  
Kevin Wu ◽  
Lin Gou ◽  
Marlene Becerra ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Visual Perception ◽  
Visual System ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Visual Information ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Lateral Geniculate ◽  
Visual Cortices ◽  
Dorsal Lateral Geniculate

AbstractThe mammalian visual system is one of the most well-studied brain systems. Visual information from the retina is relayed to the dorsal lateral geniculate nucleus of the thalamus (LGd). The LGd then projects topographically to primary visual cortex (VISp) to mediate visual perception. In this view, the VISp is a critical network hub where visual information must traverse LGd-VISp circuits to reach higher-order ‘extrastriate’ visual cortices. However, decades of conflicting reports in a variety of mammals support or refute the existence of extrastriate LGd connections that can bypass the VISp. Here, we provide evidence of bidirectional extrastriate connectivity with the mouse LGd. Using small, discrete coinjections of anterograde and retrograde tracers within the thalamus and cortex, our cross-validated approach identified bidirectional thalamocortical connectivity between LGd and extrastriate visual cortices. Our findings support the existence of extrastriate LGd circuits and provide novel understanding of LGd organization in rodent visual system.

Age dependent modification of cytochrome oxidase activity in the cat dorsal lateral geniculate nucleus following removal of primary visual cortex

1996 ◽  
Vol 13 (5) ◽  
pp. 805-816 ◽  
Author(s):  
Bertram R. Payne ◽  
Stephen G. Lomber
Keyword(s):  
Visual Cortex ◽  
Cytochrome Oxidase ◽  
Lateral Geniculate Nucleus ◽  
Oxidase Activity ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Cytochrome Oxidase Activity ◽  
Lateral Geniculate ◽  
Areas 17 And 18 ◽  
C Complex ◽  
Dorsal Lateral Geniculate

AbstractThe purpose of the present study was to assess changes in the levels of cytochrome oxidase (CO) activity in the dorsal lateral geniculate nucleus (dLGN) of the adult cat following removal of primary visual cortical areas 17 and 18 on the day of birth (P1), P28, or in adulthood (≫6 months). Cytochrome oxidase activity was measured in histological sections 9 or more months after the cortical ablation. Control measures obtained from intact cats show that CO activity is normally highest in the A-laminae of dLGN, and slightly lower in the C-complex. Following visual cortex ablations incurred at any age, CO activity levels are reduced in the A-laminae. This reduction is most profound following ablations incurred on P28 or in adulthood. In contrast, CO activity in the C-complex of dLGN is at nearly normal levels following ablations on P1 or P28, but not in adulthood. These findings contribute to our understanding of the role played by the dLGN in the transfer of visual signals along retino-geniculo-extrastriate pathways that expand following early removal of areas 17 and 18. Moreover, they have implications for our understanding of spared behavioral functions attributed to the extrastriate cortex in cats which incurred early damage of areas 17 and 18.

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