Ultrastructure of geniculocortical synaptic connections in the tree shrew striate cortex
نویسندگان
چکیده
منابع مشابه
Functional specificity of callosal connections in tree shrew striate cortex.
Although callosal connections have been shown to link extensive regions of primary visual cortex, the distribution of these connections with respect to the map of visual space and the map of orientation preference remains unclear. Here we combine optical imaging of intrinsic signals with injection of fluorescent microspheres to assess the functional specificity of callosal connections in the tr...
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We examined the termination patterns of single geniculocortical axons in the striate cortex of the tree shrew by using intracellular recording and horseradish peroxidase staining methods. Axons were classified by whether they responded to light onset (ON center) or light offset (OFF center) and whether they were driven by the ipsi- or contralateral eye. Afferents with ON-center responses end in...
متن کاملOrientation selectivity and the arrangement of horizontal connections in tree shrew striate cortex.
Horizontal connections, formed primarily by the axon collaterals of pyramidal neurons in layer 2/3 of visual cortex, extend for millimeters parallel to the cortical surface and form patchy terminations. Previous studies have provided evidence that the patches formed by horizontal connections exhibit modular specificity, preferentially linking columns of neurons with similar response characteris...
متن کاملSynaptic organization of connections between the temporal cortex and pulvinar nucleus of the tree shrew.
We examined the synaptic organization of reciprocal connections between the temporal cortex and the dorsal (Pd) and central (Pc) subdivisions of the tree shrew pulvinar nucleus, regions innervated by the medial and lateral superior colliculus, respectively. Both Pd and Pc subdivisions project topographically to 2 separate regions of the temporal cortex; small injections of anterograde tracers p...
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Intrinsic connections within the tree shrew (Tupaia glis) visual cortex (area 17) are organized in periodic stripelike patterns within layers I, II, and III. This anatomical network resembles the regularly organized stripes of 2-deoxyglucose accumulation seen after stimulation of alert animals with uniformly oriented lines. Such connections imply that widespread lateral interactions are superim...
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ژورنال
عنوان ژورنال: Journal of Comparative Neurology
سال: 2015
ISSN: 0021-9967
DOI: 10.1002/cne.23907