Laminar structure of the dorsal lateral geniculate nucleus in the tree shrew (Tupaia glis)

1967 ◽  
Vol 131 (2) ◽  
pp. 93-102 ◽  
Author(s):  
Mitchell Glickstein
Keyword(s):  
Lateral Geniculate Nucleus ◽  
Tree Shrew ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Laminar Structure ◽  
Lateral Geniculate ◽  
Tupaia Glis ◽  
Dorsal Lateral Geniculate

Laminar organization of tree shrew dorsal lateral geniculate nucleus

1983 ◽  
Vol 50 (6) ◽  
pp. 1330-1342 ◽  
Author(s):  
J. L. Conway ◽  
P. H. Schiller
Keyword(s):  
Lateral Geniculate Nucleus ◽  
Tree Shrew ◽  
Visual Stimuli ◽  
Optic Tract ◽  
Cell Types ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Lateral Geniculate ◽  
Tupaia Glis ◽  
Dorsal Lateral Geniculate ◽  
Laminar Specificity

This study investigated the organization of the dorsal lateral geniculate nucleus (LGN) of the tree shrew (Tupaia glis) using both microelectrode recording and anatomical techniques. The tree shrew LGN contains approximately 100,000 cells, of which 20% are in layers 2 and 6. These two layers receive input from the ipsilateral eye. The topography of the tree shrew LGN was delineated by taking systematic penetrations through the structure. Examination of the organization of the LGN laminae showed the following: in layer 1 (the lamina next to the optic tract) a mixture of on-center, off-center and on-off center cells was found; the majority of these cells responded transiently to visual stimuli and they had slightly longer conduction latencies than did cells in the other laminae. On-center and off-center cells in laminae 2-6 were sharply segregated: layers 2, 3, and 4 contained off-center cells and layers 5 and 6 contained on-center cells. Most of the cells in laminae 2-6 responded in a sustained manner to visual stimuli. These results suggest that one function of the LGN lamina is to group cells into various classes. Such grouping has now been shown to occur partially or completely for 1) eye of origin, 2) cell types characterized as on-center and off-center, and 3) cell types characterized as producing transient and sustained responses. The nature and degree of laminar specificity, however, varies considerably from species to species.

scholarly journals Synaptic properties of the feedback connections from the thalamic reticular nucleus to the dorsal lateral geniculate nucleus

2020 ◽  
Vol 124 (2) ◽  
pp. 404-417 ◽  
Author(s):  
Peter W. Campbell ◽  
Gubbi Govindaiah ◽  
Sean P. Masterson ◽  
Martha E. Bickford ◽  
William Guido
Keyword(s):  
Lateral Geniculate Nucleus ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Thalamic Reticular Nucleus ◽  
Reticular Nucleus ◽  
Lateral Geniculate ◽  
Dependent Form ◽  
Dorsal Lateral Geniculate ◽  
Feedback Connections ◽  
Spike Firing ◽  
Stimulation Of

The thalamic reticular nucleus (TRN) modulates thalamocortical transmission through inhibition. In mouse, TRN terminals in the dorsal lateral geniculate nucleus (dLGN) form synapses with relay neurons but not interneurons. Stimulation of TRN terminals in dLGN leads to a frequency-dependent form of inhibition, with higher rates of stimulation leading to a greater suppression of spike firing. Thus, TRN inhibition appears more dynamic than previously recognized, having a graded rather than an all-or-none impact on thalamocortical transmission.

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