Transgeniculate signal transmission to middle suprasylvian cortex in intact cats and following early removal of areas 17 and 18: a morphological study

1997 ◽  
Vol 114 (1) ◽  
pp. 11-23 ◽  
Author(s):  
Margaret A. MacNeil ◽  
Gillian Einstein ◽  
Bertram R. Payne
Keyword(s):  
Morphological Study ◽  
Signal Transmission ◽  
Early Removal ◽  
Suprasylvian Cortex ◽  
Areas 17 And 18

scholarly journals Rewiring of Transcortical Projections to Middle Suprasylvian Cortex Following Early Removal of Cat Areas 17 and 18

1996 ◽  
Vol 6 (3) ◽  
pp. 362-376 ◽  
Author(s):  
Margaret A. MacNeil ◽  
Stephen G. Lomber ◽  
Bertram R. Payne
Keyword(s):  
Early Removal ◽  
Suprasylvian Cortex ◽  
Areas 17 And 18

Projections from V1 to lateral suprasylvian cortex: An efferent pathway in the cat's visual cortex that originates preferentially from CO blob columns

1999 ◽  
Vol 16 (5) ◽  
pp. 849-860 ◽  
Author(s):  
JAMIE D. BOYD ◽  
JOANNE A. MATSUBARA
Keyword(s):  
Visual Cortex ◽  
Local Density ◽  
Mammalian Species ◽  
Retrograde Labeling ◽  
Area 19 ◽  
Efferent Pathway ◽  
Lateral Suprasylvian Cortex ◽  
Suprasylvian Cortex ◽  
Areas 17 And 18 ◽  
Y Cells

The patchy pattern of retrograde labeling produced by injections of anatomical tracers into the lateral suprasylvian (LS) visual area was compared to the cytochrome oxidase (CO) blobs in cat visual cortex. Following large injections of anatomical tracers in LS, retrograde labeling formed an irregular lattice of patches with a spacing of slightly less than 1 mm in area 17, and slightly greater than 1 mm in area 18. By comparing labeling in alternate serial sections, patches of LS-projecting cells in both areas were found to align with CO blobs. The conclusion of alignment between CO blob columns and patches of LS-projecting cells was confirmed by a quantitative analysis which showed a significant correlation between the local density of LS-projecting cells in reconstructions of charted cells and the intensity of CO staining in the CO-reacted sections. As for areas 17 and 18, labeling in other afferent areas of LS was also patchy with a spacing on the order of 1 mm except for area 19 where we found patches of LS-projecting cells with a larger spacing, roughly 2 mm. No matching fluctuations in CO density could be discerned in area 19, however. In conjunction with recent evidence that CO blob columns in cats receive strong input from Y-cells of the lateral geniculate nucleus (Boyd & Matsubara, 1996; Shoham, et al., 1996), these data support the hypothesis (Shipp & Grant, 1991) that the patches of LS-projecting cells correspond to Y-cell input columns. As a relationship between the CO architecture and certain classes of efferent cells has previously been shown in primates, these findings show new similarities between CO blobs in different mammalian species.

Expansion of suprasylvian cortex projection in the superficial layers of the superior colliculus following damage of areas 17 and 18 in developing cats

1994 ◽  
Vol 11 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Jun-Shiw Sun ◽  
Stephen G. Lomber ◽  
Bertram R. Payne
Keyword(s):  
Image Analysis ◽  
Superior Colliculus ◽  
Immature Brain ◽  
Age Dependent ◽  
Suprasylvian Cortex ◽  
Areas 17 And 18

AbstractTritiated proline and leucine were injected into areas 17 and 18 of intact cats and into the medial bank of the lateral suprasylvian (LS) cortex of intact cats and cats from which areas 17 and 18 had been removed on postnatal day 1 (P1), P28, or in adulthood (A). The density of label transported to the superior colliculus was quantified using image-analysis equipment. The results from the intact cats confirmed previous reports that areas 17 and 18 project most heavily to stratum zonale (SZ) and stratum griseum superficiale (SGS) and LS cortex projects most heavily to stratum opticum (SO) of the superior colliculus. However, in cats with lesions of areas 17 and 18, the projections from LS cortex showed an age-dependent reorganization. LS projections to SGS and SZ were enhanced following ablation of areas 17 and 18 on P1, and projections to SGS were enhanced following an ablation on P28. The pattern of LS-collicular projection following ablations incurred in adulthood was indistinguishable from the pattern presented by intact cats. This study demonstrates that the LS corticocollicular projection expands in SGS and possibly substitutes for inputs eliminated by the removal of areas 17 and 18 from the immature brain. This enhanced pathway may contribute to compensatory neuronal changes and to spared behaviors that accompany damage of immature cortex.

Techniques for preparing the Lolium perenne coleorhiza for scanning electron microscope evaluation

1992 ◽  
Vol 50 (1) ◽  
pp. 766-767
Author(s):  
Susan B.G. Debaene ◽  
John S. Gardner ◽  
Phil S. Allen
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Lolium Perenne ◽  
Morphological Study ◽  
Root Hairs ◽  
Inner Pressure ◽  
Water Potentials ◽  
Radicle Emergence ◽  
Standard Fixation ◽  
Scanning Electron

The coleorhiza is a nonvascular sheath that encloses the embryonic radicle in Poaceae, and is generally the first tissue to emerge during germination. Delicate hairlike extensions develop from some coleorhiza cells prior to radicle emergence. Similar to root hairs, coleorhiza hairs are extremely sensitive to desiccation and are damaged by exposure to negative water potentials. The coleorhiza of Lolium perenne is somewhat spherical when first visible, after which a knob forms at a right angle to the caryopsis due to inner pressure from the elongating radicle. This knob increases in length until the radicle finally punctures the coleorhiza. Standard fixation procedures cause severe desiccation of coleorhiza cells and hairs, making morphological study of the coleorhiza difficult. This study was conducted to determine a more successful process for coleorhiza preservation.

A morphological study on spermatogenesis in the liver fluke, Clonorchis sinensis

1976 ◽  
Vol 14 (2) ◽  
pp. 123 ◽  
Author(s):  
Kye Heon Jeong ◽  
Han Jong Rim ◽  
He Young Yang ◽  
Woo Kap Kim ◽  
Chang Whan Kim
Keyword(s):  
Morphological Study ◽  
Liver Fluke ◽  
Clonorchis Sinensis
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