Double representation of the body surface within cytoarchitectonic area 3b and 1 in “SI” in the owl monkey (aotus trivirgatus)

@article{Merzenich1978DoubleRO,
  title={Double representation of the body surface within cytoarchitectonic area 3b and 1 in “SI” in the owl monkey (aotus trivirgatus)},
  author={Michael Merzenich and Jon H. Kaas and Mriganka Sur and Chia‐Sheng Lin},
  journal={Journal of Comparative Neurology},
  year={1978},
  volume={181}
}
Microelectrode multiunit mapping studies of parietal cortex in owl monkeys indicate that the classical “primary” somatosensory region (or “SI”) including the separate architectonic fields 3a, 3b, 1, and 2 contains as many as four separate representations of the body rather than one. An analysis of receptive field locations for extensive arrays of closely placed recording sites in parietal cortex which were later related to cortical architecture led to the following conclusions: (1) There are… 

Representations of the body surface in cortical areas 3b and 1 of squirrel monkeys: Comparisons with other primates

Remarkably, the representations of some body parts were reversed in orientation in both area 3b and area 1 in squirrel monkeys as compared to owl and macaque monkeys, suggesting that both fields are divided into sectors where the basic somatotopic orientation is independently determined, that the orientation of some of these sectors is subject to reversal in evolution, and that matching sectors in areas3b and 1 are not independent in somattopic organization.

Representations of the body surface in postcentral parietal cortex of Macaca fascicularis

The somatotopic organization of the postcentral parietal cortex of the Old World monkey, Macaca fascicularis, was determined with multi‐unit microelectrode recordings and it is suggested that the representation in Area 3b is homologous to “SmI” (or “SI”) in non‐primates.

Connections of areas 3b and 1 of the parietal somatosensory strip with the ventroposterior nucleus in the owl monkey (Aotus trivirgatus)

In injections of HRP combined with the anterograde tracer, 3H‐proline, indicate that VP neurons are reciprocally interconnected with both Areas 3b and 1, and it appears that some neurons in VP project to both cortical representations.

Organization of the S I Cortex

There are two complete representations of the body surface and two representations of deep body structures within the classical primate “S I”, and the two large cutaneous representations are coincident with cytoarchitectonic areas 3b and 1.

The organization and connections of somatosensory cortex in marmosets

  • LA KrubitzerJ. Kaas
  • Biology
    The Journal of neuroscience : the official journal of the Society for Neuroscience
  • 1990
Microelectrode mapping methods were used to define and describe 3 representations of the body surface in somatosensory cortex of marmosets: S-I proper or area 3b of anterior parietal cortex, S-II,

The representation of the body surface in S-I of cats

The results indicate that a single representation of the body surface occupies most or all of the traditional S-I region including cortex defined as area ‘3b,’ area “1,” and much of area ”2” but excluding area � “3a”, which is quite different in cats than in monkeys.

Variability in hand surface representations in areas 3b and 1 in adult owl and squirrel monkeys

Detailed microelectrode maps of the hand representation were derived in cortical areas 3b and 1 from a series of normal adult owl and squirrel monkeys, and all maps were internally topographic.

Cortical connections to single digit representations in area 3b of somatosensory cortex in squirrel monkeys and prosimian galagos

Analysis of cortical inputs to individual digit representations of area 3b in four squirrel monkeys and one prosimian galago showed that feedback projections to individual digits overlapped extensively in the hand representations of areas 3b, 1, and parietal ventral (PV) and second somatosensory areas.

Magnification, receptive-field area, and "hypercolumn" size in areas 3b and 1 of somatosensory cortex in owl monkeys.

The area of cortex presumed to receive all fibers from any given receptive field was obtained and found to be independent of the body surface represented and may be akin to the “hypercolumn” proposed for primary visual cortex.
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References

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Connections of areas 3b and 1 of the parietal somatosensory strip with the ventroposterior nucleus in the owl monkey (Aotus trivirgatus)

In injections of HRP combined with the anterograde tracer, 3H‐proline, indicate that VP neurons are reciprocally interconnected with both Areas 3b and 1, and it appears that some neurons in VP project to both cortical representations.

Representation of head and face in postcentral gyrus of the macaque.

The receptive field and submodality characteristics of individual neurons within the cytoarchitectural and topographic subdivisions of the head and face areas of the postcentral gyrus (SI) were determined with the technique of extracellular recording and indicate that the functional organization of the SI cortex which receives its principal input from trigeminal mechanoreceptors is comparable to the organization within those SI regions which receive their input from the mechanoresceptors of the limbs, trunk, and tail.

Organization of auditory cortex in the owl monkey (Aotus trivirgatus)

Electrophysiological and cytoarchitectonic evidence suggest that this belt of cortex in the owl monkey is composed of at least three and possibly four separate auditory fields, which are generally less responsive to acoustic stimulation and the frequency organization is more complex than in AI or R.

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Microelectrode mapping methods were used to determine the organization of primary somatosensory cortex, SmI, in grey squirrels. A systematic representation of the contralateral body surface was found

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The neocortical region in which single units or unit clusters respond to light mechanical region in skin (SmI) is smaller than the tactile receiving area as defined by earlier evoked potentials studies, failing to extend into sylvian sulcus or to the posterior margin of the postcentral gyrus.

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It is suggested that the region of contralateral postcranial representation plus the medial rhinarium and mystacial vibrissa areas are the homologue of SmII in placental mammals, and the area of bilateral representation is homologous to SmII of placental mammal, but that the lateral vibrissa and Rhinarium areas are a specialization of somatic sensory cortex unique to the Virginia opossum.

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The study on the somatic sensory cortex of the cat to the monkey is extended not only for the obvious reason of its closer affinity to man, but also because the larger size and clearer boundaries of the architectonic and functional subdivisions of the first somatics sensory area make these individual subdivisions more amenable to investigation.
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