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Aldo Junqueira Rodrigues - One of the best experts on this subject based on the ideXlab platform.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Eduardo Santamaria Carvalhal Ribas, Koshiro Nishikuni, Aldo Junqueira Rodrigues
    Abstract:

    OBJECTIVE: The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. METHODS: The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. RESULTS: The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. CONCLUSION: These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Koshiro Nishikuni, Eduardo C Ribas, Aldo Junqueira Rodrigues
    Abstract:

    The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

Guilherme Carvalhal Ribas - One of the best experts on this subject based on the ideXlab platform.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Eduardo Santamaria Carvalhal Ribas, Koshiro Nishikuni, Aldo Junqueira Rodrigues
    Abstract:

    OBJECTIVE: The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. METHODS: The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. RESULTS: The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. CONCLUSION: These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Koshiro Nishikuni, Eduardo C Ribas, Aldo Junqueira Rodrigues
    Abstract:

    The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

D. Yves Von Cramon - One of the best experts on this subject based on the ideXlab platform.

  • Functional organization of the left inferior Precentral Sulcus: Dissociating the inferior frontal eye field and the inferior frontal junction
    NeuroImage, 2011
    Co-Authors: Jan Derrfuss, D. Yves Von Cramon, Christian J. Fiebach, V.l. Vogt, Marc Tittgemeyer
    Abstract:

    Two eye fields have been described in the human lateral frontal cortex: the frontal eye field (FEF) and the inferior frontal eye field (iFEF). The FEF has been extensively studied and has been found to lie at the ventral part of the superior Precentral Sulcus. Much less research, however, has focused on the iFEF. Recently, it was suggested that the iFEF is located at the dorsal part of the inferior Precentral Sulcus. A similar location was proposed for the inferior frontal junction area (IFJ), an area thought to be involved in cognitive control processes. The present study used fMRI to clarify the topographical and functional relationship of the iFEF and the IFJ in the left hemispheres of individual participants. The results show that both the iFEF and the IFJ are indeed located at the dorsal part of the inferior Precentral Sulcus. Nevertheless, the activations were spatially dissociable in every individual examined. The IFJ was located more towards the depth of the inferior Precentral Sulcus, close to the junction with the inferior frontal Sulcus, whereas the iFEF assumed a more lateral, posterior and superior position. Furthermore, the results provided evidence for a functional double dissociation: the iFEF was activated only in a comparison of saccades vs. button presses, but not in a comparison of incongruent vs. congruent Stroop conditions, while the opposite pattern was found at the IFJ. These results provide evidence for a spatial and functional dissociation of two directly adjacent areas in the left posterior frontal lobe.

  • Neural activations at the junction of the inferior frontal Sulcus and the inferior Precentral Sulcus: interindividual variability, reliability, and association with sulcal morphology.
    Human brain mapping, 2009
    Co-Authors: Jan Derrfuss, Marcel Brass, D. Yves Von Cramon, Gabriele Lohmann, Katrin Amunts
    Abstract:

    The sulcal morphology of the human frontal lobe is highly variable. Although the structural images usually acquired in functional magnetic resonance imaging studies provide information about this interindividual variability, this information is only rarely used to relate structure and function. Here, we investigated the spatial relationship between posterior frontolateral activations in a task-switching paradigm and the junction of the inferior frontal Sulcus and the inferior Precentral Sulcus (inferior frontal junction, IFJ) on an individual-subject basis. Results show that, although variable in terms of stereotaxic coordinates, the posterior frontolateral activations observed in task-switching are consistently and reliably located at the IFJ in the brains of individual participants. The IFJ shares such consistent localization with other nonprimary areas as motion-sensitive area V5/MT and the frontal eye field. Building on tension-based models of morphogenesis, this structure-function correspondence might indicate that the cytoarchitectonic area underlying activations of the IFJ develops at early stages of cortical folding.

  • Cognitive control in the posterior frontolateral cortex: evidence from common activations in task coordination, interference control, and working memory.
    NeuroImage, 2004
    Co-Authors: Jan Derrfuss, Marcel Brass, D. Yves Von Cramon
    Abstract:

    Cognitive control has often been associated with activations of middorsolateral prefrontal cortex. However, recent evidence highlights the importance of a more posterior frontolateral region around the junction of the inferior frontal Sulcus and the inferior Precentral Sulcus (the inferior frontal junction area, IFJ). In the present experiment, we investigated the involvement of the IFJ in a task-switching paradigm, a manual Stroop task, and a verbal n-back task in a within-session within-group design. After computing contrasts for the individual tasks, the resulting z maps were overlaid to identify areas commonly activated by these tasks. Common activations were found in the IFJ, in the pre-SMA extending into mesial BA 8, in the middle frontal gyrus bordering the inferior frontal Sulcus, in the anterior insula, and in parietal and thalamic regions. These results indicate the existence of a network of prefrontal, parietal, and subcortical regions mediating cognitive control in task coordination, interference control, and working memory. In particular, the results provide evidence for the assumption that, in the frontolateral cortex, not only the middorsolateral region but also the IFJ plays an important role in cognitive control.

  • The Role of the Frontal Cortex in Task Preparation
    Cerebral cortex (New York N.Y. : 1991), 2002
    Co-Authors: Marcel Brass, D. Yves Von Cramon
    Abstract:

    The ability to prepare a task is crucial for the voluntary control of our actions. It enables us to react flexibly and rapidly to a changing environment. In the present event-related functional magnetic resonance imaging study we investigated task preparation with a task-cueing paradigm. In this paradigm we intermixed trials in which a task cue and a target were presented with trials in which only the task cue was presented. Analysis of these cue-only trials allowed us to isolate task-preparation related control from execution-related control processes. By means of this paradigm, we could demonstrate that a frontal network was related to task preparation. Further analysis revealed that the fronto-lateral cortex at the junction of Precentral Sulcus and inferior frontal Sulcus and the presupplementary motor area are the crucial frontal components in task preparation.

Koshiro Nishikuni - One of the best experts on this subject based on the ideXlab platform.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Eduardo Santamaria Carvalhal Ribas, Koshiro Nishikuni, Aldo Junqueira Rodrigues
    Abstract:

    OBJECTIVE: The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. METHODS: The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. RESULTS: The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. CONCLUSION: These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Koshiro Nishikuni, Eduardo C Ribas, Aldo Junqueira Rodrigues
    Abstract:

    The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

Alexandre Yasuda - One of the best experts on this subject based on the ideXlab platform.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Eduardo Santamaria Carvalhal Ribas, Koshiro Nishikuni, Aldo Junqueira Rodrigues
    Abstract:

    OBJECTIVE: The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. METHODS: The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. RESULTS: The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. CONCLUSION: These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.

  • Surgical anatomy of microneurosurgical sulcal key points.
    Neurosurgery, 2006
    Co-Authors: Guilherme Carvalhal Ribas, Alexandre Yasuda, Koshiro Nishikuni, Eduardo C Ribas, Aldo Junqueira Rodrigues
    Abstract:

    The brain sulci constitute the main microanatomic delimiting landmarks and surgical corridors of modern microneurosurgery. Because of the frequent difficulty in intraoperatively localizing and visually identifying the brain sulci with assurance, the main purpose of this study was to establish cortical/sulcal key points of primary microneurosurgical importance to provide a sulcal anatomic framework for the placement of craniotomies and to facilitate the main sulci intraoperative identification. The study was performed through the evaluation of 32 formalin-fixed cerebral hemispheres of 16 adult cadavers, which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes necessary for the evaluation of cranial-cerebral relationships. Three-dimensional anatomic and surgical images are displayed to illustrate the use of sulcal key points. The points studied were the anterior sylvian point, the inferior rolandic point, the intersection of the inferior frontal Sulcus with the Precentral Sulcus, the intersection of the superior frontal Sulcus with the Precentral Sulcus, the superior rolandic point, the intersection of the intraparietal Sulcus with the postcentral Sulcus, the superior point of the parieto-occipital Sulcus, the euryon (the craniometric point that corresponds to the center of the parietal tuberosity), the posterior point of the superior temporal Sulcus, and the opisthocranion, which corresponds to the most prominent point of the occipital bossa. These points presented regular neural and cranial-cerebral relationships and can be considered consistent microsurgical cortical key points. These sulcal and gyral key points can be particularly useful for initial intraoperative sulci identification and dissection. Together, they compose a framework that can help in the understanding of hemispheric lesion localization, in the placement of supratentorial craniotomies, as landmarks for the transsulcal approaches to periventricular and intraventricular lesions, and in orienting the anatomic removal of gyral sectors that contain infiltrative tumors.