scholarly journals Collateral sulcus

2017 ◽  
Author(s):  
Calum Worsley ◽  
Frank Gaillard
Keyword(s):  
Collateral Sulcus

scholarly journals Quantitative analysis of size and regional distribution of corpora amylacea in the hippocampal formation of obstructive sleep apnoea patients

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cuicui Xu ◽  
Jessica E. Owen ◽  
Thorarinn Gislason ◽  
Bryndis Benediktsdottir ◽  
Stephen R. Robinson
Keyword(s):  
Obstructive Sleep Apnoea ◽  
Lateral Ventricle ◽  
Hippocampal Formation ◽  
Regional Distribution ◽  
Sleep Apnoea ◽  
Corpora Amylacea ◽  
Obstructive Sleep ◽  
Collateral Sulcus ◽  
Cornu Ammonis ◽  
New Material

AbstractCorpora amylacea (CoA) are spherical aggregates of glucose polymers and proteins within the periventricular, perivascular and subpial regions of the cerebral cortex and the hippocampal cornu ammonis (CA) subfields. The present study quantified the distribution of CoA in autopsied hippocampi of patients with obstructive sleep apnoea (OSA) using ethanolamine-induced fluorescence. CoA were observed in 29 of 30 patients (96.7%). They were most abundant in periventricular regions (wall of lateral ventricle, alveus, fimbria and CA4), rarely found in the CA3 and CA1, and undetectable in the CA2 or subiculum. A spatiotemporal sequence of CoA deposition was postulated, beginning in the fimbria and progressively spreading around the subpial layer until they extended medially to the wall of the lateral ventricle and laterally to the collateral sulcus. This ranked CoA sequence was positively correlated with CoA packing density (count and area fraction) and negatively correlated with CoA minimum diameters (p < 0.05). Although this sequence was not correlated with age or body mass index (BMI), age was positively correlated with the mean and maximum diameters of CoA. These findings support the view that the spatiotemporal sequence of CoA deposition is independent of age, and that CoA become larger due to the accretion of new material over time.

scholarly journals Effect of Motion Contrast on Human Cortical Responses to Moving Stimuli

1998 ◽  
Vol 79 (5) ◽  
pp. 2794-2803 ◽  
Author(s):  
Gordon L. Shulman ◽  
Jacob Schwarz ◽  
Francis M. Miezin ◽  
Steven E. Petersen
Keyword(s):  
Superior Temporal Sulcus ◽  
Square Wave ◽  
Moving Stimuli ◽  
Positron Emission ◽  
Motion Condition ◽  
Collateral Sulcus ◽  
Cortical Responses ◽  
Motion Contrast ◽  
The Right ◽  
Unidirectional Motion

Shulman, Gordon L., Jacob Schwarz, Francis M. Miezin, and Steven E. Petersen. Effect of motion contrast on human cortical responses to moving stimuli. J. Neurophysiol. 79: 2794–2803, 1998. The cortical areas activated by motion-defined contours were studied in humans using positron emission tomography (PET). Subjects observed four types of random dot fields, displayed through a 21° diam aperture: unidirectional motion of a translating dot field, motion in opposing directions of two superimposed translating fields, motion in opposing directions of dots in contiguous spatial regions (motion contrast), producing a square wave grating defined by motion, and luminance variation of stationary dots in contiguous spatial regions, producing a square wave grating defined by luminance. Relative to a static dot field, the unidirectional motion condition activated areas previously described, including areas 17/18, lateral temporal-occipital–parietal cortex (MT/MST), and the superior temporal sulcus. Motion-defined gratings increased the activation of areas 17/18 and MT/MST, but not the superior temporal sulcus, and added more dorsal areas in the cuneus, roughly corresponding to V3/V3a, and ventral areas in the lingual gyrus/collateral sulcus, roughly corresponding to V2/VP. Luminance defined gratings, relative to a static dot field, activated areas 17/18, regions in the dorsal cuneus similar to those activated by motion defined gratings, and a region near the left collateral sulcus, slightly lateral to the motion grating activation. They also activated a region in the right fusiform gyrus that was more weakly activated by the motion grating. These results indicate that adding motion contrast to large moving fields increases activity in areas 17/18 and MT/MST and adds both dorsal and ventral regions that are similar for motion and luminance defined contours.

scholarly journals Study of fetal and postnatal morphological development of the brain sulci

2013 ◽  
Vol 11 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Koshiro Nishikuni ◽  
Guilherme Carvalhal Ribas
Keyword(s):  
Morphological Changes ◽  
Fetal Brain ◽  
Postnatal Period ◽  
Postnatal Life ◽  
Morphological Development ◽  
Fetal Life ◽  
Brain Hemispheres ◽  
Collateral Sulcus ◽  
Fetal Brain Development ◽  
The Brain

Object The surface of the developing fetal brain undergoes significant morphological changes during fetal growth. The purpose of this study was to evaluate the morphological development of the brain sulci from the fetal to the early postnatal period. Methods Two hundred fourteen brain hemispheres from 107 human brain specimens were examined to evaluate the timing of sulcal formation, from its appearance to its complete development. These brains were obtained from cadavers ranging in age from 12 weeks of gestation to 8 months of postnatal life. Results The order of appearance of the cerebral sulci, and the number and percentages of specimens found in this study were as follows: longitudinal cerebral fissure at 12 weeks (10/10, 100%); callosal sulcus at 12 weeks (10/10, 100%); hippocampal sulcus at 15 weeks (7/10, 70%); lateral sulcus at 17 weeks (20/22, 90.9%); circular insular sulcus at 17 weeks (18/22, 81.8%); olfactory sulcus at 17 weeks (18/22, 81.8%); calcarine sulcus at 17 weeks (14/22, 63.6%); parietooccipital sulcus at 17 weeks (11/22, 50%); cingulate sulcus at 19 weeks (16/20, 80%); central sulcus at 21 weeks (22/38, 57.9%); orbital sulcus at 22 weeks (9/16, 56.2%); lunate sulcus at 24 ± 2 weeks (12/16, 75%); collateral sulcus at 24 ± 2 weeks (8/16, 50%); superior frontal sulcus at 25 ± 2 weeks (5/6, 83.3%); rhinal sulcus at 25 ± 2 weeks (3/6, 50%); precentral sulcus at 26 ± 3 weeks (2/4, 50%); postcentral sulcus at 26 ± 3 weeks (2/4, 50%); superior temporal sulcus at 26 ± 3 weeks (2/4, 50%); central insular sulcus at 29 ± 2 weeks (4/4, 100%); intraparietal sulcus at 29 ± 2 weeks (2/4, 50%); paraolfactory sulcus at 29 ± 2 weeks (2/4, 50%); inferior frontal sulcus at 30 ± 3 weeks (2/4, 50%); transverse occipital sulcus at 30 ± 3 weeks (2/4, 50%); occipitotemporal sulcus at 30 ± 3 weeks (2/4, 50%); marginal branch of the cingulate sulcus at 30 ± 3 weeks (2/4, 50%); paracentral sulcus at 30 ± 3 weeks (2/4, 50%); subparietal sulcus at 30 ± 3 weeks (2/4, 50%); inferior temporal sulcus at 31 ± 3 weeks (3/6, 50%); transverse temporal sulcus at 33 ± 3 weeks (6/8, 75%); and secondary sulcus at 38 ± 3 weeks (2/4, 50%). Conclusions The brain is subjected to considerable morphological changes throughout gestation. During fetal brain development the cortex begins to fold in, thereby increasing the cortical surface. All primary sulci are formed during fetal life. The appearance of each sulcus follows a characteristic timing pattern, which may be used as one of the reliable guides pertinent to gestational age and normal fetal development.

Interhemispheric Integration at Different Spatial Scales: The Evidence From EEG Coherence and fMRI

2006 ◽  
Vol 96 (1) ◽  
pp. 259-275 ◽  
Author(s):  
Maria G. Knyazeva ◽  
Eleonora Fornari ◽  
Reto Meuli ◽  
Philippe Maeder
Keyword(s):  
Spatial Scales ◽  
Neural Substrates ◽  
Blood Oxygen Level Dependent ◽  
Specific Information ◽  
Eeg Coherence ◽  
Blood Oxygen Level ◽  
Spatial Frequencies ◽  
Collateral Sulcus ◽  
Gestalt Grouping ◽  
The Brain

The early visual system processes different spatial frequencies (SFs) separately. To examine where in the brain the scale-specific information is integrated, we mapped the neural assemblies engaged in interhemispheric coupling with electroencephalographic (EEG) coherence and blood-oxygen-level dependent (BOLD) signal. During similar EEG and functional magnetic resonance imaging (fMRI) experiments, our subjects viewed centrally presented bilateral gratings of different SF (0.25–8.0 cpd), which either obeyed Gestalt grouping rules (iso-oriented, IG) or violated them (orthogonally oriented, OG). The IG stimuli (0.5–4.0 cpd) synchronized EEG at discrete beta frequencies (beta1, beta2) and increased BOLD (0.5 and 2.0 cpd tested) in ventral (around collateral sulcus) and dorsal (parieto-occipital fissure) regions compared with OG. At both SF, the beta1 coherence correlated with the ventral activations, whereas the beta2 coherence correlated with the dorsal ones. Thus distributed neural substrates mediated interhemispheric integration at single SF. The relative impact of the ventral versus dorsal networks was modulated by the SF of the stimulus.

Morphological patterns of the collateral sulcus in the human brain

2012 ◽  
Vol 35 (8) ◽  
pp. 1295-1311 ◽  
Author(s):  
Sonja C. Huntgeburth ◽  
Michael Petrides
Keyword(s):  
Human Brain ◽  
Collateral Sulcus ◽  
Morphological Patterns

scholarly journals Transtentorial transcollateral sulcus approach to the ventricular atrium: an endoscope-assisted anatomical study

2017 ◽  
Vol 126 (4) ◽  
pp. 1246-1252 ◽  
Author(s):  
Yasser Jeelani ◽  
Abdulkerim Gokoglu ◽  
Tomer Anor ◽  
Ossama Al-Mefty ◽  
Alan R. Cohen
Keyword(s):  
Cortical Thickness ◽  
Lateral Ventricle ◽  
Tracking System ◽  
Anatomical Study ◽  
Parahippocampal Gyrus ◽  
Lingual Gyrus ◽  
Novel Approach ◽  
Collateral Sulcus ◽  
Brain Retraction ◽  
Formalin Fixed

OBJECTIVE Conventional approaches to the atrium of the lateral ventricle may be associated with complications related to direct cortical injury or brain retraction. The authors describe a novel approach to the atrium through a retrosigmoid transtentorial transcollateral sulcus corridor. METHODS Bilateral retrosigmoid craniotomies were performed on 4 formalin-fixed, colored latex–injected human cadaver heads (a total of 8 approaches). Microsurgical dissections were performed under 3× to 24× magnification, and endoscopic visualization was provided by 0° and 30° rigid endoscope lens systems. Image guidance was provided by coupling an electromagnetic tracking system with an open source software platform. Objective measurements on cortical thickness traversed and total depth of exposure were recorded. Additionally, the basal occipitotemporal surfaces of 10 separate cerebral hemisphere specimens were examined to define the surface topography of sulci and gyri, with attention to the appearance and anatomical patterns and variations of the collateral sulcus and the surrounding gyri. RESULTS The retrosigmoid approach allowed for clear visualization of the basal occipitotemporal surface. The collateral sulcus was identified and permitted easy endoscopic access to the ventricular atrium. The conical corridor thus obtained provided an average base working area of 3.9 cm2 at an average depth of 4.5 cm. The mean cortical thickness traversed to enter the ventricle was 1.4 cm. The intraventricular anatomy of the ipsilateral ventricle was defined clearly in all 8 exposures in this manner. The anatomy of the basal occipitotemporal surface, observed in a total of 18 hemispheres, showed a consistent pattern, with the collateral sulcus abutted by the parahippocampal gyrus medially, and the fusiform and lingual gyrus laterally. The collateral sulcus was found to be caudally bifurcated in 14 of the 18 specimens. CONCLUSIONS The retrosigmoid supracerebellar transtentorial transcollateral sulcus approach is technically feasible. This approach has the potential advantage of providing a short and direct path to the atrium, hence avoiding violation of deep neurovascular structures and preserving eloquent areas. Although this approach appears unconventional, it may provide a minimally invasive option for the surgical management of selected lesions within the atrium of the lateral ventricle.

Epidermoid tumour within the collateral sulcus: A rare location and atypical presentation

2008 ◽  
Vol 15 (8) ◽  
pp. 950-954 ◽  
Author(s):  
Necmettin Tanriover ◽  
Tibet Kacira ◽  
Mustafa Onur Ulu ◽  
Nurperi Gazioglu ◽  
Buge Oz ◽  
...  
Keyword(s):  
Atypical Presentation ◽  
Collateral Sulcus ◽  
Rare Location ◽  
Epidermoid Tumour

scholarly journals Identification of the ventral occipital visual field maps in the human brain

2016 ◽  
Author(s):  
Jonathan Winawer ◽  
Nathan Witthoft
Keyword(s):  
Visual Field ◽  
Human Brain ◽  
Human Subjects ◽  
Polar Angle ◽  
Vertical Meridian ◽  
Retinotopic Mapping ◽  
Collateral Sulcus ◽  
Anatomical Images ◽  
Visual Field Maps ◽  
Magnetic Resonance Imaging Mri

The location and topography of the first three visual field maps in the human brain, V1-V3, are well agreed upon and routinely measured across most laboratories. The position of 4th visual field map, "hV4", is identified with less consistency in the neuroimaging literature. Using magnetic resonance imaging (MRI) data, we describe landmarks to help identify the position and borders of hV4. The data consist of anatomical images, visualized as cortical meshes to highlight the sulcal and gyral patterns, and functional data obtained from retinotopic mapping experiments, visualized as eccentricity and angle maps on the cortical surface. Several features of the functional and anatomical data can be found across nearly all subjects and are helpful for identifying the location and extent of the hV4 map. The medial border of hV4 is shared with the posterior, ventral portion of V3, and is marked by a retinotopic representation of the upper vertical meridian. The anterior border of hV4 is shared with the VO-1 map, and falls on a retinotopic representation of the peripheral visual field, usually coincident with the posterior transverse collateral sulcus. The ventro-lateral edge of the map typically falls on the inferior occipital gyrus, where functional MRI artifacts often obscure the retinotopic data. Finally, we demonstrate the continuity of retinotopic parameters between hV4 and its neighbors; hV4 and V3v contain iso-eccentricity lines in register, whereas hV4 and VO-1 contain iso-polar angle lines in register. Together, the multiple constraints allow for a consistent identification of the hV4 map across most human subjects.

The collateral sulcus as landmark for the parahippocampal cortex

NeuroImage ◽  
1998 ◽  
Vol 7 (4) ◽  
pp. S694
Author(s):  
Véronique D. Bohbot ◽  
Michael Petrides ◽  
Alan C. Evans
Keyword(s):  
Parahippocampal Cortex ◽  
Collateral Sulcus
Sign in / Sign up

Export Citation Format

Share Document