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Chan-young Choi - One of the best experts on this subject based on the ideXlab platform.

  • A understanding of the temporal stem.
    Journal of Korean Neurosurgical Society, 2010
    Co-Authors: Chan-young Choi, Seong-rok Han, Gi-taek Yee, Chae-heuck Lee
    Abstract:

    Objective : There has been inconsistency about definition of the temporal stem despite of several descriptions demonstrating its microanatomy using fiber dissection and/or diffusion tensor tractography. This study was designed to clarify three dimensional configurations of the temporal stem. Methods : The fronto-temporal regions of several formalin-fixed human cerebral hemispheres were dissected under an operating microscope using the fiber dissection technique. The consecutive coronal cuts of the dissected specimens were made to define the relationships of white matter tracts comprising the temporal stem and the subcortical gray matters (thalamus, caudate nucleus, amygdala) with inferior limiting (circular) sulcus of insula. Results : The inferior limiting sulcus of insula, Limen insulae, medial sylvian groove, and caudate nucleus/amygdala were more appropriate anatomical structures than the roof/dorso-lateral wall of the temporal horn and lateral geniculate body which were used to describe previously for delineating the temporal stem. The particular space located inside the line connecting the inferior limiting sulcus of insula, Limen insulae, medial sylvian groove/amygdala, and tail of caudate nucleus could be documented. This space included the extreme capsule, uncinate fasciculus, inferior occipito-frontal fasciculus, anterior commissure, ansa peduncularis, and inferior thalamic peduncle including optic radiations, whereas the stria terminalis, cingulum, fimbria, and inferior longitudinal fiber of the temporal lobe were not passing through this space. Also, this continued posteriorly along the caudate nucleus and limiting sulcus of the insula. Conclusion : The temporal stem is white matter fibers passing through a particular space of the temporal lobe located inside the line connecting the inferior limiting sulcus of insula, Limen insulae, medial sylvian groove/amygdala, and tail of caudate nucleus. The three dimensional configurations of the temporal stem are expected to give the very useful anatomical and surgical insights in the temporal lobe. 10.3340/jkns.2010.47.5.365

  • meyer s loop and the optic radiations in the transsylvian approach to the mediobasal temporal lobe
    Neurosurgery, 2006
    Co-Authors: Chan-young Choi, Pablo Rubino, Juan C Fernandezmiranda, Albert L Rhoton
    Abstract:

    OBJECTIVE: In the transsylvian approach to the mediobasal temporal structures, the temporal horn is approached through the floor of the sylvian fissure. The anterior bundle of the optic radiations (Meyer's loop) courses between the floor of the sylvian fissure and roof of the temporal horn and could be damaged in this approach. This study was designed to define the route through the floor of the sylvian fissure least likely to damage the optic pathways. METHODS: Meyer's loop was dissected by applying Klingler's fiber dissection technique in 10 formalin-fixed human hemispheres. Several measurements quantified the relationship of the Meyer's loop to surgically important structures. RESULTS: This study identified a triangular safe area below the floor of the sylvian fissure through which the temporal horn could be accessed in the transsylvian approach with a low risk of damaging the optic radiations. An incision in the floor of the sylvian fissure directed downward at the level of Limen insula and the adjacent 5 mm of the inferior insular sulcus would avoid the optic radiations. An incision directed straight downward 10, 15, and 20 mm behind the Limen in the inferior insular sulcus would cross Meyer's loop and would need to be directed downward and medially as much as 80 degrees from the sagittal plane to avoid Meyer's loop. CONCLUSION: In the transsylvian approach to the temporal horn, incisions at the level of the Limen, or adjacent 5 mm of the inferior insular sulcus, are less likely to damage Meyer's loop and the optic radiations than more posterior incisions along the inferior insular sulcus. Incision at this safe level commonly opens into the amygdala, a portion of which is removed to provide entry into the temporal horn for removal of the mediobasal structures.

  • meyer s loop and the optic radiations in the transsylvian approach to the mediobasal temporal lobe commentary
    Neurosurgery, 2006
    Co-Authors: Chan-young Choi, Pablo Rubino, Juan C Fernandezmiranda, Albert L Rhoton, Nobuhiro Mikuni, Nobuo Hashimoto, Evandro De Oliveira, Gazi M Yasargil, Saleem I Abdulrauf, Wolf Ludemann
    Abstract:

    OBJECTIVE: In the transsylvian approach to the mediobasal temporal structures, the temporal horn is approached through the floor of the sylvian fissure. The anterior bundle of the optic radiations (Meyer's loop) courses between the floor of the sylvian fissure and roof of the temporal horn and could be damaged in this approach. This study was designed to define the route through the floor of the sylvian fissure least likely to damage the optic pathways. METHODS: Meyer's loop was dissected by applying Klingler's fiber dissection technique in 10 formalin-fixed human hemispheres. Several measurements quantified the relationship of the Meyer's loop to surgically important structures. RESULTS: This study identified a triangular safe area below the floor of the sylvian fissure through which the temporal horn could be accessed in the transsylvian approach with a low risk of damaging the optic radiations. An incision in the floor of the sylvian fissure directed downward at the level of Limen insula and the adjacent 5 mm of the inferior insular sulcus would avoid the optic radiations. An incision directed straight downward 10, 15, and 20 mm behind the Limen in the inferior insular sulcus would cross Meyer's loop and would need to be directed downward and medially as much as 80 degrees from the sagittal plane to avoid Meyer's loop. CONCLUSION: In the transsylvian approach to the temporal horn, incisions at the level of the Limen, or adjacent 5 mm of the inferior insular sulcus, are less likely to damage Meyer's loop and the optic radiations than more posterior incisions along the inferior insular sulcus. Incision at this safe level commonly opens into the amygdala, a portion of which is removed to provide entry into the temporal horn for removal of the mediobasal structures.

Na-jia Liu - One of the best experts on this subject based on the ideXlab platform.

  • Diffusion tensor tractography of the temporal stem on the inferior limiting sulcus
    Journal of neurosurgery, 2008
    Co-Authors: Feng Wang, Tao Sun, Na-jia Liu
    Abstract:

    Object The aim of this study was to use diffusion tensor tractography (DTT) to define the 3D relationships of the uncinate fasciculus, anterior commissure, inferior occipitofrontal fasciculus, inferior thalamic peduncle, and optic radiation and to determine the positioning landmarks of these white matter tracts. Methods The anatomy was studied in 10 adult human brain specimens. Brain DTT was performed in 10 healthy volunteers. Diffusion tensor tractography images of the white matter tracts in the temporal stem were obtained using the simple single region of interest (ROI) and multi-ROIs based on the anatomical knowledge. Results The posteroinferior insular point is the anterior extremity of intersection of the Heschl gyrus and the inferior limiting sulcus. On the inferior limiting sulcus, this point is the posterior limit of the optic radiation, and the temporal stem begins at the Limen insulae and ends at the posteroinferior insular point. The distance from the Limen insulae to the tip of the temporal ho...

Feng Wang - One of the best experts on this subject based on the ideXlab platform.

  • Diffusion tensor tractography of the temporal stem
    Chinese journal of radiology, 2008
    Co-Authors: Feng Wang, Tao Sun
    Abstract:

    Objective To define the three-dimensional relationship of the uncinate fasciculus,anterior commissure, inferior occipitofrontal fasciculus, and optic radiation, to determine the positioning landmarks of these white matter tracts by using the diffusion tensor tractography (DTT). Methods The anatomy was studied in 10 adult human brain specimens (20 hemispheres). DTT of the brain was performed on 10 healthy volunteers. DTT of the white matter tracts in the temporal stem was performed by using of the simple one regions-of-interest (ROI) and muhiple-ROl based on the anatomic knowledge and conventional magnetic resonance imaging (MRI). Results The inferior limiting sulcus averaged (46.3 ± 3.1)mm in length. The shortest distance from the inferior limiting sulcus to the superior floor of the temporal horn averaged (6.5 ± 1.8)mm. The posteroinferior insular point was the anterior extremity of intersection of the Heschl's gyrus and the inferior limiting sulcns. On the inferior limiting sulcns, this point was the posterior border of the optic radiation, and the temporal stem begined at the Limen insulae and ended at the posteroinferior insular point. Its length averaged (33.0 ± 2. 9) mm. The distance from the Limen insulae to the tip of the temporal horn averaged(10.9 ± 1.7)mm is just one thirds of the length of the temporal stem.The uncinate fasciculus and anterior commissure made up the core of the anterior temporal stem, with the anterior commissure located psoteriorly, and they occupied the anterior one third of the temporal stem together. The inferior occipitofrontal fasciculus passed through the entire temporal stem. The most anterior extension of Meyer's loop was located between the anterior tip of the temporal horn and the Limen insulea.However, Most of the optic radiation crossed the postmedian two thirds of the temporal stem. Conclusion On the inferior limiting sulcus, the posteroinferior insular point is a reliable landmark of the posterior border of the optic radiations. The Limen insulae, anterior tip of the temporal horn, and posteroinferior insular point may be used to localize the white matter fibers of the temporal stem in analyzing MR imaging or during surgery. Key words: Brain;  Magnetic resonance imaging;  Anatomy

  • Diffusion tensor tractography of the temporal stem on the inferior limiting sulcus
    Journal of neurosurgery, 2008
    Co-Authors: Feng Wang, Tao Sun, Na-jia Liu
    Abstract:

    Object The aim of this study was to use diffusion tensor tractography (DTT) to define the 3D relationships of the uncinate fasciculus, anterior commissure, inferior occipitofrontal fasciculus, inferior thalamic peduncle, and optic radiation and to determine the positioning landmarks of these white matter tracts. Methods The anatomy was studied in 10 adult human brain specimens. Brain DTT was performed in 10 healthy volunteers. Diffusion tensor tractography images of the white matter tracts in the temporal stem were obtained using the simple single region of interest (ROI) and multi-ROIs based on the anatomical knowledge. Results The posteroinferior insular point is the anterior extremity of intersection of the Heschl gyrus and the inferior limiting sulcus. On the inferior limiting sulcus, this point is the posterior limit of the optic radiation, and the temporal stem begins at the Limen insulae and ends at the posteroinferior insular point. The distance from the Limen insulae to the tip of the temporal ho...

Albert L Rhoton - One of the best experts on this subject based on the ideXlab platform.

  • meyer s loop and the optic radiations in the transsylvian approach to the mediobasal temporal lobe
    Neurosurgery, 2006
    Co-Authors: Chan-young Choi, Pablo Rubino, Juan C Fernandezmiranda, Albert L Rhoton
    Abstract:

    OBJECTIVE: In the transsylvian approach to the mediobasal temporal structures, the temporal horn is approached through the floor of the sylvian fissure. The anterior bundle of the optic radiations (Meyer's loop) courses between the floor of the sylvian fissure and roof of the temporal horn and could be damaged in this approach. This study was designed to define the route through the floor of the sylvian fissure least likely to damage the optic pathways. METHODS: Meyer's loop was dissected by applying Klingler's fiber dissection technique in 10 formalin-fixed human hemispheres. Several measurements quantified the relationship of the Meyer's loop to surgically important structures. RESULTS: This study identified a triangular safe area below the floor of the sylvian fissure through which the temporal horn could be accessed in the transsylvian approach with a low risk of damaging the optic radiations. An incision in the floor of the sylvian fissure directed downward at the level of Limen insula and the adjacent 5 mm of the inferior insular sulcus would avoid the optic radiations. An incision directed straight downward 10, 15, and 20 mm behind the Limen in the inferior insular sulcus would cross Meyer's loop and would need to be directed downward and medially as much as 80 degrees from the sagittal plane to avoid Meyer's loop. CONCLUSION: In the transsylvian approach to the temporal horn, incisions at the level of the Limen, or adjacent 5 mm of the inferior insular sulcus, are less likely to damage Meyer's loop and the optic radiations than more posterior incisions along the inferior insular sulcus. Incision at this safe level commonly opens into the amygdala, a portion of which is removed to provide entry into the temporal horn for removal of the mediobasal structures.

  • meyer s loop and the optic radiations in the transsylvian approach to the mediobasal temporal lobe commentary
    Neurosurgery, 2006
    Co-Authors: Chan-young Choi, Pablo Rubino, Juan C Fernandezmiranda, Albert L Rhoton, Nobuhiro Mikuni, Nobuo Hashimoto, Evandro De Oliveira, Gazi M Yasargil, Saleem I Abdulrauf, Wolf Ludemann
    Abstract:

    OBJECTIVE: In the transsylvian approach to the mediobasal temporal structures, the temporal horn is approached through the floor of the sylvian fissure. The anterior bundle of the optic radiations (Meyer's loop) courses between the floor of the sylvian fissure and roof of the temporal horn and could be damaged in this approach. This study was designed to define the route through the floor of the sylvian fissure least likely to damage the optic pathways. METHODS: Meyer's loop was dissected by applying Klingler's fiber dissection technique in 10 formalin-fixed human hemispheres. Several measurements quantified the relationship of the Meyer's loop to surgically important structures. RESULTS: This study identified a triangular safe area below the floor of the sylvian fissure through which the temporal horn could be accessed in the transsylvian approach with a low risk of damaging the optic radiations. An incision in the floor of the sylvian fissure directed downward at the level of Limen insula and the adjacent 5 mm of the inferior insular sulcus would avoid the optic radiations. An incision directed straight downward 10, 15, and 20 mm behind the Limen in the inferior insular sulcus would cross Meyer's loop and would need to be directed downward and medially as much as 80 degrees from the sagittal plane to avoid Meyer's loop. CONCLUSION: In the transsylvian approach to the temporal horn, incisions at the level of the Limen, or adjacent 5 mm of the inferior insular sulcus, are less likely to damage Meyer's loop and the optic radiations than more posterior incisions along the inferior insular sulcus. Incision at this safe level commonly opens into the amygdala, a portion of which is removed to provide entry into the temporal horn for removal of the mediobasal structures.

Tao Sun - One of the best experts on this subject based on the ideXlab platform.

  • Diffusion tensor tractography of the temporal stem
    Chinese journal of radiology, 2008
    Co-Authors: Feng Wang, Tao Sun
    Abstract:

    Objective To define the three-dimensional relationship of the uncinate fasciculus,anterior commissure, inferior occipitofrontal fasciculus, and optic radiation, to determine the positioning landmarks of these white matter tracts by using the diffusion tensor tractography (DTT). Methods The anatomy was studied in 10 adult human brain specimens (20 hemispheres). DTT of the brain was performed on 10 healthy volunteers. DTT of the white matter tracts in the temporal stem was performed by using of the simple one regions-of-interest (ROI) and muhiple-ROl based on the anatomic knowledge and conventional magnetic resonance imaging (MRI). Results The inferior limiting sulcus averaged (46.3 ± 3.1)mm in length. The shortest distance from the inferior limiting sulcus to the superior floor of the temporal horn averaged (6.5 ± 1.8)mm. The posteroinferior insular point was the anterior extremity of intersection of the Heschl's gyrus and the inferior limiting sulcns. On the inferior limiting sulcns, this point was the posterior border of the optic radiation, and the temporal stem begined at the Limen insulae and ended at the posteroinferior insular point. Its length averaged (33.0 ± 2. 9) mm. The distance from the Limen insulae to the tip of the temporal horn averaged(10.9 ± 1.7)mm is just one thirds of the length of the temporal stem.The uncinate fasciculus and anterior commissure made up the core of the anterior temporal stem, with the anterior commissure located psoteriorly, and they occupied the anterior one third of the temporal stem together. The inferior occipitofrontal fasciculus passed through the entire temporal stem. The most anterior extension of Meyer's loop was located between the anterior tip of the temporal horn and the Limen insulea.However, Most of the optic radiation crossed the postmedian two thirds of the temporal stem. Conclusion On the inferior limiting sulcus, the posteroinferior insular point is a reliable landmark of the posterior border of the optic radiations. The Limen insulae, anterior tip of the temporal horn, and posteroinferior insular point may be used to localize the white matter fibers of the temporal stem in analyzing MR imaging or during surgery. Key words: Brain;  Magnetic resonance imaging;  Anatomy

  • Diffusion tensor tractography of the temporal stem on the inferior limiting sulcus
    Journal of neurosurgery, 2008
    Co-Authors: Feng Wang, Tao Sun, Na-jia Liu
    Abstract:

    Object The aim of this study was to use diffusion tensor tractography (DTT) to define the 3D relationships of the uncinate fasciculus, anterior commissure, inferior occipitofrontal fasciculus, inferior thalamic peduncle, and optic radiation and to determine the positioning landmarks of these white matter tracts. Methods The anatomy was studied in 10 adult human brain specimens. Brain DTT was performed in 10 healthy volunteers. Diffusion tensor tractography images of the white matter tracts in the temporal stem were obtained using the simple single region of interest (ROI) and multi-ROIs based on the anatomical knowledge. Results The posteroinferior insular point is the anterior extremity of intersection of the Heschl gyrus and the inferior limiting sulcus. On the inferior limiting sulcus, this point is the posterior limit of the optic radiation, and the temporal stem begins at the Limen insulae and ends at the posteroinferior insular point. The distance from the Limen insulae to the tip of the temporal ho...