Spiny stellates as cells of origin of association fibres from area 17 to area 18 in the cat's neocortex

Neurons in the cat's area 17 were stained in Golgi-like fashion following injection of horseradish peroxidase into area 18. Such staining allows classification of neurons on the basis of dendritic morphology. The types of neurons found in area 17 are: pyramidal cells in layers 2, 3 and 4ab; spiny stellate cells in the lower part of layer 3, and in layer 4ab; and a few pyramidal and spindle cells in layer 5. The axons of the spiny stellate cells are finer than those of pyramidal cells; they give off collaterals in deeper cortical layers and may bifurcate when entering the white matter. Spiny stellates in area 17 do not project to area 19; after injections are made into area 17, these neurons are found neither in area 18 nor in area 19. The spiny stellate cell with a long axon is thus categorized as a projection neuron which takes part in the pathway from area 17 to ipsilateral and contralateral area 18.

[1]  J. Lund,et al.  Interlaminar connections and pyramidal neuron organisation in the visual cortex, area 17, of the Macaque monkey , 1975 .

[2]  S. Levay,et al.  Synaptic patterns in the visual cortex of the cat and monkey. Electron microscopy of Golgi Preparations , 1973, The Journal of comparative neurology.

[3]  R OTSUKA,et al.  [On the structure and segmentation of the cortical center of vision in the cat]. , 1962, Archiv fur Psychiatrie und Nervenkrankheiten, vereinigt mit Zeitschrift fur die gesamte Neurologie und Psychiatrie.

[4]  Donald A. Keefer,et al.  Horseradish peroxidase as a retrogradely-transported, detailed dendritic marker , 1978, Brain Research.

[5]  J. Stone,et al.  Properties of relay cells in cat's lateral geniculate nucleus: a comparison of W-cells with X- and Y-cells. , 1976, Journal of neurophysiology.

[6]  L. Palmer,et al.  The retinotopic organization of area 17 (striate cortex) in the cat , 1978, The Journal of comparative neurology.

[7]  S. Zeki.  Functional organization of a visual area in the posterior bank of the superior temporal sulcus of the rhesus monkey , 1974, The Journal of physiology.

[8]  M. Sanders.  Handbook of Sensory Physiology , 1975 .

[9]  C. Gilbert,et al.  Laminar patterns of geniculocortical projection in the cat , 1976, Brain Research.

[10]  G. Innocenti,et al.  Morphological correlates of visual field transformation in the corpus callosum , 1976, Neuroscience Letters.

[11]  Sholl Da,et al.  The organization of the visual cortex in the cat. , 1955 .

[12]  J. Stone,et al.  Projection of X- and Y-cells of the cat's lateral geniculate nucleus to areas 17 and 18 of visual cortex. , 1973, Journal of neurophysiology.

[13]  J. O'leary,et al.  Structure of the area striata of the cat , 1941 .

[14]  K. Albus,et al.  Second and third visual areas of the cat: interindividual variability in retinotopic arrangement and cortical location , 1980, The Journal of physiology.

[15]  J. Adams,et al.  Technical considerations on the use of horseradish peroxidase as a neuronal marker , 1977, Neuroscience.

[16]  W. Levick,et al.  Lateral geniculate relay of slowly conducting retinal afferents to cat visual cortex. , 1976, The Journal of physiology.

[17]  C. Gilbert,et al.  The projections of cells in different layers of the cat's visual cortex , 1975, The Journal of comparative neurology.

[18]  T. Wiesel,et al.  Morphology and intracortical projections of functionally characterised neurones in the cat visual cortex , 1979, Nature.

[19]  J. Szentágothai.  Synaptology of the Visual Cortex , 1973 .

[20]  J. Lund,et al.  The origin of efferent pathways from the primary visual cortex, area 17, of the macaque monkey as shown by retrograde transport of horseradish peroxidase , 1975, The Journal of comparative neurology.

[21]  S. Sherman,et al.  Structure of physiologically identified X and Y cells in the cat's lateral geniculate nucleus. , 1979, Science.

[22]  D. Ferster,et al.  The axonal arborizations of lateral geniculate neurons in the striate cortex of the cat , 1978, The Journal of comparative neurology.