Skip to main content
Journal cover image

Lateral geniculate projections to the superficial layers of visual cortex in the tree shrew.

Publication ,  Journal Article
Usrey, WM; Muly, EC; Fitzpatrick, D
Published in: J Comp Neurol
May 1, 1992

Our recent studies of tree shrew striate cortex have focused on the organization of lateral geniculate projections to layer IV and the projections from IV to layer III. Although these pathways play an important role in determining the response properties of layer III neurons, there are additional pathways from the lateral geniculate nucleus (LGN) that terminate directly in layer III. Previous studies provided evidence that these projections originate from layers 6 and 3 of the LGN and terminate in different subdivisions of layer III. In this study we used injections of biocytin to examine the projections of layers 6 and 3 to the cortex in more detail. Consistent with earlier work, we found that LGN layer 6 projects heavily to lower IIIc, while LGN layer 3 terminates densely in layer IIIb and sparsely throughout layers IIIa-I. In addition, we found that neurons in layers 6 and 3 have collateral projections: neurons in LGN layer 6 project to the bottom of layer IVb and sparsely to I-IIIb; neurons in LGN layer 3 project sparsely to layers V and VI and to the middle of IV. These patterns of projections are significant in the light of our studies of the connections from cortical layer IV to layer III. LGN projections to the superficial layers are organized into parallel pathways that exert selective influence over different populations of neurons in layers I-III and on the layer IV neurons that supply them.

Duke Scholars

Published In

J Comp Neurol

DOI

ISSN

0021-9967

Publication Date

May 1, 1992

Volume

319

Issue

1

Start / End Page

159 / 171

Location

United States

Related Subject Headings

  • Visual Cortex
  • Tupaiidae
  • Species Specificity
  • Neurons
  • Neurology & Neurosurgery
  • Geniculate Bodies
  • Axonal Transport
  • Animals
  • 3209 Neurosciences
  • 3109 Zoology
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Usrey, W. M., Muly, E. C., & Fitzpatrick, D. (1992). Lateral geniculate projections to the superficial layers of visual cortex in the tree shrew. J Comp Neurol, 319(1), 159–171. https://doi.org/10.1002/cne.903190113
Usrey, W. M., E. C. Muly, and D. Fitzpatrick. “Lateral geniculate projections to the superficial layers of visual cortex in the tree shrew.J Comp Neurol 319, no. 1 (May 1, 1992): 159–71. https://doi.org/10.1002/cne.903190113.
Usrey WM, Muly EC, Fitzpatrick D. Lateral geniculate projections to the superficial layers of visual cortex in the tree shrew. J Comp Neurol. 1992 May 1;319(1):159–71.
Usrey, W. M., et al. “Lateral geniculate projections to the superficial layers of visual cortex in the tree shrew.J Comp Neurol, vol. 319, no. 1, May 1992, pp. 159–71. Pubmed, doi:10.1002/cne.903190113.
Usrey WM, Muly EC, Fitzpatrick D. Lateral geniculate projections to the superficial layers of visual cortex in the tree shrew. J Comp Neurol. 1992 May 1;319(1):159–171.
Journal cover image

Published In

J Comp Neurol

DOI

ISSN

0021-9967

Publication Date

May 1, 1992

Volume

319

Issue

1

Start / End Page

159 / 171

Location

United States

Related Subject Headings

  • Visual Cortex
  • Tupaiidae
  • Species Specificity
  • Neurons
  • Neurology & Neurosurgery
  • Geniculate Bodies
  • Axonal Transport
  • Animals
  • 3209 Neurosciences
  • 3109 Zoology