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Yoshihiro Fukui - One of the best experts on this subject based on the ideXlab platform.

  • correlation between formation of the Calcarine Sulcus and morphological maturation of the lateral ventricle in cynomolgus monkey fetuses
    Acta Neurobiologiae Experimentalis, 2011
    Co-Authors: Katsuhiro Fukunishi, Masatoshi Kashima, Kazuhiko Sawada, Hiromi Sakatahaga, Shigeyoshi Saito, Takayuki Sukamoto, Ichio Aoki, Yoshihiro Fukui
    Abstract:

    In the present study developmental changes in the cerebral sulci and volumes of subcortical and archicortical structures of the cerebrum in cynomolgus monkey fetuses were examined with T(1)-weighted magnetic resonance (MR) images in 3D. On the embryonic day (ED) 90, the lateral ventricle had still an immature vesicular shape in the occipital region of the cerebrum, and it dramatically closed its lumen by ED 100. In that period the Calcarine Sulcus progressively infolded from the medial surface of the cerebral hemisphere narrowing the lumen of the lateral ventricle in the occipital region. Volume of the lateral ventricle decreased in the period ED 90-100, increasing afterwards in spite of increasing volumes of subcortical and archicortical structures such as the caudate nucleus, putamen, globus pallidus, amygdala and hippocampal formation. During the same time, the volume of the germinal matrix around lateral ventricles decreased to disappear completely by ED 120. These results suggest that the morphological maturation of lateral ventricle is linked to the development of Calcarine Sulcus in cynomolgus monkey fetuses. The degree of infolding of Calcarine Sulcus on ED 100 would be useful as a gross anatomical landmark for evaluating the cerebral maturation in cynomolgus monkey fetuses.

  • development of cerebral sulci and gyri in fetuses of cynomolgus monkeys macaca fascicularis ii gross observation of the medial surface
    Brain Structure & Function, 2008
    Co-Authors: Masatoshi Kashima, Kazuhiko Sawada, Katsuhiro Fukunishi, Hiromi Sakatahaga, Hiroshi Tokado, Yoshihiro Fukui
    Abstract:

    This study aimed to clarify chronological sequences of the appearances of sulci and gyri on the medial cerebral surface and its relation to the regional development of the cerebrum in cynomolgus monkeys. The lengths of cingulate and Calcarine sulci were measured, and the ratios of these lengths to fronto-occipital length were estimated as indices of the size of the “frontoparietal” and “occipital” regions, respectively. The relative length of cingulate Sulcus showed a biphasic increase: a slow phase from EDs 100 to 110, and a rapid phase from EDs 110 to 130. The gyri in the “frontoparietal region” were convoluted in the limbic cortex during the initial slow phase and in the neocortical region during the rapid phase. The relative length of Calcarine Sulcus lineally increased between EDs 90 and 130, and the gyri in the “occipital region” generated in a dorso-ventral manner: the gyrus convolutions occurred first in the “phylogenetically older” striate and dorsal extrastriate cortices, and then in the “phylogenetically newer” ventral extrastriate cortex. The results suggest that the chronological order of appearance of sulci and gyri is closely associated with the order of phylogenetical development of the cerebral cortex. The present study provides a standard reference for the development of cerebral sulci and gyri of cynomolgus monkeys together with our previous study (Fukunishi et al. Anat Embryol 211:757–764, 2006).

Kazuhiko Sawada - One of the best experts on this subject based on the ideXlab platform.

  • correlation between formation of the Calcarine Sulcus and morphological maturation of the lateral ventricle in cynomolgus monkey fetuses
    Acta Neurobiologiae Experimentalis, 2011
    Co-Authors: Katsuhiro Fukunishi, Masatoshi Kashima, Kazuhiko Sawada, Hiromi Sakatahaga, Shigeyoshi Saito, Takayuki Sukamoto, Ichio Aoki, Yoshihiro Fukui
    Abstract:

    In the present study developmental changes in the cerebral sulci and volumes of subcortical and archicortical structures of the cerebrum in cynomolgus monkey fetuses were examined with T(1)-weighted magnetic resonance (MR) images in 3D. On the embryonic day (ED) 90, the lateral ventricle had still an immature vesicular shape in the occipital region of the cerebrum, and it dramatically closed its lumen by ED 100. In that period the Calcarine Sulcus progressively infolded from the medial surface of the cerebral hemisphere narrowing the lumen of the lateral ventricle in the occipital region. Volume of the lateral ventricle decreased in the period ED 90-100, increasing afterwards in spite of increasing volumes of subcortical and archicortical structures such as the caudate nucleus, putamen, globus pallidus, amygdala and hippocampal formation. During the same time, the volume of the germinal matrix around lateral ventricles decreased to disappear completely by ED 120. These results suggest that the morphological maturation of lateral ventricle is linked to the development of Calcarine Sulcus in cynomolgus monkey fetuses. The degree of infolding of Calcarine Sulcus on ED 100 would be useful as a gross anatomical landmark for evaluating the cerebral maturation in cynomolgus monkey fetuses.

  • development of cerebral sulci and gyri in fetuses of cynomolgus monkeys macaca fascicularis ii gross observation of the medial surface
    Brain Structure & Function, 2008
    Co-Authors: Masatoshi Kashima, Kazuhiko Sawada, Katsuhiro Fukunishi, Hiromi Sakatahaga, Hiroshi Tokado, Yoshihiro Fukui
    Abstract:

    This study aimed to clarify chronological sequences of the appearances of sulci and gyri on the medial cerebral surface and its relation to the regional development of the cerebrum in cynomolgus monkeys. The lengths of cingulate and Calcarine sulci were measured, and the ratios of these lengths to fronto-occipital length were estimated as indices of the size of the “frontoparietal” and “occipital” regions, respectively. The relative length of cingulate Sulcus showed a biphasic increase: a slow phase from EDs 100 to 110, and a rapid phase from EDs 110 to 130. The gyri in the “frontoparietal region” were convoluted in the limbic cortex during the initial slow phase and in the neocortical region during the rapid phase. The relative length of Calcarine Sulcus lineally increased between EDs 90 and 130, and the gyri in the “occipital region” generated in a dorso-ventral manner: the gyrus convolutions occurred first in the “phylogenetically older” striate and dorsal extrastriate cortices, and then in the “phylogenetically newer” ventral extrastriate cortex. The results suggest that the chronological order of appearance of sulci and gyri is closely associated with the order of phylogenetical development of the cerebral cortex. The present study provides a standard reference for the development of cerebral sulci and gyri of cynomolgus monkeys together with our previous study (Fukunishi et al. Anat Embryol 211:757–764, 2006).

Masatoshi Kashima - One of the best experts on this subject based on the ideXlab platform.

  • correlation between formation of the Calcarine Sulcus and morphological maturation of the lateral ventricle in cynomolgus monkey fetuses
    Acta Neurobiologiae Experimentalis, 2011
    Co-Authors: Katsuhiro Fukunishi, Masatoshi Kashima, Kazuhiko Sawada, Hiromi Sakatahaga, Shigeyoshi Saito, Takayuki Sukamoto, Ichio Aoki, Yoshihiro Fukui
    Abstract:

    In the present study developmental changes in the cerebral sulci and volumes of subcortical and archicortical structures of the cerebrum in cynomolgus monkey fetuses were examined with T(1)-weighted magnetic resonance (MR) images in 3D. On the embryonic day (ED) 90, the lateral ventricle had still an immature vesicular shape in the occipital region of the cerebrum, and it dramatically closed its lumen by ED 100. In that period the Calcarine Sulcus progressively infolded from the medial surface of the cerebral hemisphere narrowing the lumen of the lateral ventricle in the occipital region. Volume of the lateral ventricle decreased in the period ED 90-100, increasing afterwards in spite of increasing volumes of subcortical and archicortical structures such as the caudate nucleus, putamen, globus pallidus, amygdala and hippocampal formation. During the same time, the volume of the germinal matrix around lateral ventricles decreased to disappear completely by ED 120. These results suggest that the morphological maturation of lateral ventricle is linked to the development of Calcarine Sulcus in cynomolgus monkey fetuses. The degree of infolding of Calcarine Sulcus on ED 100 would be useful as a gross anatomical landmark for evaluating the cerebral maturation in cynomolgus monkey fetuses.

  • development of cerebral sulci and gyri in fetuses of cynomolgus monkeys macaca fascicularis ii gross observation of the medial surface
    Brain Structure & Function, 2008
    Co-Authors: Masatoshi Kashima, Kazuhiko Sawada, Katsuhiro Fukunishi, Hiromi Sakatahaga, Hiroshi Tokado, Yoshihiro Fukui
    Abstract:

    This study aimed to clarify chronological sequences of the appearances of sulci and gyri on the medial cerebral surface and its relation to the regional development of the cerebrum in cynomolgus monkeys. The lengths of cingulate and Calcarine sulci were measured, and the ratios of these lengths to fronto-occipital length were estimated as indices of the size of the “frontoparietal” and “occipital” regions, respectively. The relative length of cingulate Sulcus showed a biphasic increase: a slow phase from EDs 100 to 110, and a rapid phase from EDs 110 to 130. The gyri in the “frontoparietal region” were convoluted in the limbic cortex during the initial slow phase and in the neocortical region during the rapid phase. The relative length of Calcarine Sulcus lineally increased between EDs 90 and 130, and the gyri in the “occipital region” generated in a dorso-ventral manner: the gyrus convolutions occurred first in the “phylogenetically older” striate and dorsal extrastriate cortices, and then in the “phylogenetically newer” ventral extrastriate cortex. The results suggest that the chronological order of appearance of sulci and gyri is closely associated with the order of phylogenetical development of the cerebral cortex. The present study provides a standard reference for the development of cerebral sulci and gyri of cynomolgus monkeys together with our previous study (Fukunishi et al. Anat Embryol 211:757–764, 2006).

D. Le Bihan - One of the best experts on this subject based on the ideXlab platform.

  • Transient activity in the human Calcarine cortex during visual-mental imagery: an event-related fMRI study.
    Journal of Cognitive Neuroscience, 2000
    Co-Authors: I. Klein, A. L. Paradis, J. B. Poline, S. M. Kosslyn, D. Le Bihan
    Abstract:

    Although it is largely accepted that visual-mental imagery and perception draw on many of the same neural structures, the existence and nature of neural processing in the primary visual cortex (or area V1) during visual imagery remains controversial. We tested two general hypotheses: The first was that V1 is activated only when images with many details are formed and used, and the second was that V1 is activated whenever images are formed, even if they are not necessarily used to perform a task. We used event-related functional magnetic resonance imaging (ER-fMRI) to detect and characterize the activity in the Calcarine Sulcus (which contains the primary visual cortex) during single instances of mental imagery. The results revealed reproducible transient activity in this area whenever participants generated or evaluated a mental image. This transient activity was strongly enhanced when participants evaluated characteristics of objects, whether or not details actually needed to be extracted from the image to perform the task. These results show that visual imagery processing commonly involves the earliest stages of the visual system.

Katsuhiro Fukunishi - One of the best experts on this subject based on the ideXlab platform.

  • correlation between formation of the Calcarine Sulcus and morphological maturation of the lateral ventricle in cynomolgus monkey fetuses
    Acta Neurobiologiae Experimentalis, 2011
    Co-Authors: Katsuhiro Fukunishi, Masatoshi Kashima, Kazuhiko Sawada, Hiromi Sakatahaga, Shigeyoshi Saito, Takayuki Sukamoto, Ichio Aoki, Yoshihiro Fukui
    Abstract:

    In the present study developmental changes in the cerebral sulci and volumes of subcortical and archicortical structures of the cerebrum in cynomolgus monkey fetuses were examined with T(1)-weighted magnetic resonance (MR) images in 3D. On the embryonic day (ED) 90, the lateral ventricle had still an immature vesicular shape in the occipital region of the cerebrum, and it dramatically closed its lumen by ED 100. In that period the Calcarine Sulcus progressively infolded from the medial surface of the cerebral hemisphere narrowing the lumen of the lateral ventricle in the occipital region. Volume of the lateral ventricle decreased in the period ED 90-100, increasing afterwards in spite of increasing volumes of subcortical and archicortical structures such as the caudate nucleus, putamen, globus pallidus, amygdala and hippocampal formation. During the same time, the volume of the germinal matrix around lateral ventricles decreased to disappear completely by ED 120. These results suggest that the morphological maturation of lateral ventricle is linked to the development of Calcarine Sulcus in cynomolgus monkey fetuses. The degree of infolding of Calcarine Sulcus on ED 100 would be useful as a gross anatomical landmark for evaluating the cerebral maturation in cynomolgus monkey fetuses.

  • development of cerebral sulci and gyri in fetuses of cynomolgus monkeys macaca fascicularis ii gross observation of the medial surface
    Brain Structure & Function, 2008
    Co-Authors: Masatoshi Kashima, Kazuhiko Sawada, Katsuhiro Fukunishi, Hiromi Sakatahaga, Hiroshi Tokado, Yoshihiro Fukui
    Abstract:

    This study aimed to clarify chronological sequences of the appearances of sulci and gyri on the medial cerebral surface and its relation to the regional development of the cerebrum in cynomolgus monkeys. The lengths of cingulate and Calcarine sulci were measured, and the ratios of these lengths to fronto-occipital length were estimated as indices of the size of the “frontoparietal” and “occipital” regions, respectively. The relative length of cingulate Sulcus showed a biphasic increase: a slow phase from EDs 100 to 110, and a rapid phase from EDs 110 to 130. The gyri in the “frontoparietal region” were convoluted in the limbic cortex during the initial slow phase and in the neocortical region during the rapid phase. The relative length of Calcarine Sulcus lineally increased between EDs 90 and 130, and the gyri in the “occipital region” generated in a dorso-ventral manner: the gyrus convolutions occurred first in the “phylogenetically older” striate and dorsal extrastriate cortices, and then in the “phylogenetically newer” ventral extrastriate cortex. The results suggest that the chronological order of appearance of sulci and gyri is closely associated with the order of phylogenetical development of the cerebral cortex. The present study provides a standard reference for the development of cerebral sulci and gyri of cynomolgus monkeys together with our previous study (Fukunishi et al. Anat Embryol 211:757–764, 2006).