scholarly journals Functional morphology of the feedback pathway from area 17 of the cat visual cortex to the lateral geniculate nucleus

1996 ◽  
Vol 16 (3) ◽  
pp. 1180-1192 ◽  
Author(s):  
PC Murphy ◽  
AM Sillito
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Functional Morphology ◽  
Area 17 ◽  
Cat Visual Cortex ◽  
Lateral Geniculate ◽  
Feedback Pathway

Nicotine receptors are located on lateral geniculate nucleus terminals in cat visual cortex

1987 ◽  
Vol 412 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Glen T. Prusky ◽  
Chris Shaw ◽  
Max S. Cynader
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Cat Visual Cortex ◽  
Lateral Geniculate ◽  
Nicotine Receptors

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.

Alternating monocular exposure increases the spacing of ocularity domains in area 17 of cats

1997 ◽  
Vol 14 (5) ◽  
pp. 929-938 ◽  
Author(s):  
Suzannah Bliss Tieman ◽  
Nina Tumosa
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Ocular Dominance ◽  
Intrinsic Property ◽  
Area 17 ◽  
Ocular Dominance Columns ◽  
Area 18 ◽  
Lateral Geniculate ◽  
Transneuronal Transport

AbstractGoodhill (1993) has recently suggested that the spacing of ocularity domains in visual cortex is not solely an intrinsic property of cortex, but is determined, at least in part, by the degree of correlation in the activity of the two eyes. In support of this model, Löwel (1994) has shown that strabismus, which decorrelates the activity of the two eyes, increases the spacing of ocular dominance columns in area 17, but not area 18, of the cat. As a further test of Goodhill's model, in this paper we examine the effects of another rearing procedure that decorrelates the activity of the two eyes, namely alternating monocular exposure (AME). Cats were reared either normally (9 cats) or with AME (21 cats). We labeled their ocularity domains by one of three methods: ocular dominance columns by 2-deoxyglucose (14 cats), and ocular dominance patches by transneuronal transport (14 cats), or by injections of tracer into single layers of the lateral geniculate nucleus (LGN; 2 cats). The spacing of ocular dominance was 11% greater in the AME cats than in the normal cats (0.976 vs. 0.877 mm). These results are similar to those previously reported for strabismic cats, although the effect is less striking. We thus confirm that decorrelating the activity of the two eyes increases the spacing of cortical ocularity domains. Our results further suggest that the degree of decorrelation affects the extent of that increase.

scholarly journals Calcium-binding proteins immunoreactivity in the human subcortical and cortical visual structures

1996 ◽  
Vol 13 (6) ◽  
pp. 997-1009 ◽  
Author(s):  
G. Leuba ◽  
K. Saini
Keyword(s):  
Visual Cortex ◽  
Superior Colliculus ◽  
Lateral Geniculate Nucleus ◽  
Calcium Binding ◽  
Binding Proteins ◽  
Calcium Binding Proteins ◽  
Area 17 ◽  
Optic Radiation ◽  
Lateral Geniculate ◽  
Layer I

AbstractThe distribution of neurons and fibers immunoreactive (ir) to the three calcium-binding proteins parvalbumin (PV), calbindin D-28k (CB), and calretinin (CR) was studied in the human lateral geniculate nucleus (LGN), lateral inferior pulvinar, and optic radiation, and related to that in the visual cortex. In the LGN, PV, CR, and CB immunoreactivity was present in all laminae, slightly stronger in the magnocellular than in the parvocellular laminae for CB and CR. PV-ir puncta, representing transversally cut axons, and CR-ir fibers were revealed within the laminae and interlaminar zones, and just beyond the outer border of lamina 6 in the geniculate capsule. In the optic radiation both PV- and CR-immunoreactive neurons, puncta, and fibers were present. CB immunoreactivity was revealed in neurons of all laminae of the lateral geniculate nucleus, including S lamina and interlaminar zones. There were hardly any CB-ir puncta or fibers in the laminae, interlaminar zones, geniculate capsule, or optic radiation. In the lateral inferior pulvinar, immunoreactive neurons for the three calcium-binding proteins were present in smaller number than in the LGN, as well as PV-ir puncta and CR-ir fibers within the nucleus and in the pulvinar capsule. In the white matter underlying area 17, fibers intermingled with a few scattered neurons were stained for both PV and CR, but very rarely for CB. These fibers stopped at the limit between areas 17 and 18. Area 17 showed a dense plexus of PV-ir puncta and neurons in the thalamo-receptive layer IV and CR-ir puncta and neurons both in the superficial layers I-II, IIIC, and in layer VA. Cajal-Retzius CR-ir neurons were present in layer I. CB-ir puncta were almost confined to layer I-III and CB-ir neurons to layer II. Finally the superior colliculus exhibited mostly populations of PV and CR pyramidal-like immunoreactive neurons, mainly in the intermediate tier. These data suggest that in the visual thalamus most calcium-binding protein immunoreactive neurons project to the visual cortex, while in the superior colliculus a smaller immunoreactive population represent projection neurons.

The projection from the lateral geniculate nucleus to the prestriate cortex of the macaque monkey

1981 ◽  
Vol 213 (1190) ◽  
pp. 73-80 ◽  
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Macaque Monkey ◽  
Cell Distribution ◽  
Area 17 ◽  
Large Scatter ◽  
Large Size ◽  
Lateral Geniculate ◽  
Prestriate Cortex ◽  
The One

By injecting the enzyme horseradish peroxidase into the prestriate cortex of the macaque monkey and examining the lateral geniculate nucleus (l. g. n.) for retrograde label, the presence of a direct projection from the l. g. n. to prestriate visual cortex (Brodmann’s areas 18 and 19) was confirmed. Labelled cells occurred in all layers of the l. g. n., distributed in a roughly columnar fashion. The large scatter in cell distribution indicated a lower retinotopic precision for this projection than for the one to area 17. Labelled cells are of a medium to large size and, in each section, a few were located near the laminar border or in interlaminar zones. The functional significance of this projection is discussed.

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