Cited by 162Advanced Neuroimaging Techniques and ApplicationsFunctional Brain Connectivity StudiesTraumatic Brain Injury Research

The DOI matches its Crossref record; 32 of the 35 references it cites were found in a registry or an index; none of the 27 sources its claims cite is checked for support yet.

The Ascending Reticular Activating System from Pontine Reticular Formation to the Thalamus in the Human Brain

Open access
Yeo, Sang Seok, Chang, Pyung Hun, Jang, Sung Ho·2013·Frontiers in Human Neuroscience

Abstract

INTRODUCTION: Action of the ascending reticular activating system (ARAS) on the cerebral cortex is responsible for achievement of consciousness. In this study, we attempted to reconstruct the lower single component of the ARAS from the reticular formation (RF) to the thalamus in the normal human brain using diffusion tensor imaging (DTI). METHODS: Twenty six normal healthy subjects were recruited for this study. A 1.5-T scanner was used for scanning of diffusion tensor images, and the lower single component of the ARAS was reconstructed using FMRIB software. We utilized two ROIs for reconstruction of the lower single component of the ARAS: the seed ROI - the RF of the pons at the level of the trigeminal nerve entry zone, the target ROI - the intralaminar nuclei of the thalamus at the level of the commissural plane. RESULTS: The reconstructed ARAS originated from the pontine RF, ascended through the mesencephalic tegmentum just posterior to the red nucleus, and then terminated on the intralaminar nuclei of the thalamus. No significant differences in fractional anisotropy, mean diffusivity, and tract number were observed between hemispheres (p > 0.05). CONCLUSION: We reconstructed the lower single component of the ARAS from the RF to the thalamus in the human brain using DTI. The results of this study might be of value for the diagnosis and prognosis of patients with impaired consciousness.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This study used diffusion tensor imaging (DTI) to reconstruct the lower single component of the ascending reticular activating system (ARAS) from the pontine reticular formation to the intralaminar nuclei of the thalamus in 26 healthy adults. The reconstructed pathway was identified in all subjects, with no significant right-left hemispheric differences in FA, MD, or tract number.

Key findings

  • The reconstructed ARAS originated from the pontine reticular formation, ascended through the mesencephalic tegmentum just posterior to the red nucleus, and terminated on the intralaminar nuclei of the thalamus at the level of the commissural plane in all subjects.
  • Mean DTI values were: right ARAS FA 0.43 ± 0.05, MD 0.96 ± 0.13, tract number 156.96 ± 112.06; left ARAS FA 0.43 ± 0.04, MD 0.94 ± 0.13, tract number 159.73 ± 72.88. No significant differences in FA, MD, or tract number were observed between hemispheres (p > 0.05).
  • Pearson correlation showed no significant age-related changes in FA, MD, or tract number (p > 0.05).

Methods

  • Design: DTI tractography study in 26 normal healthy subjects (14 males, 12 females; mean age 31.85 ± 9.80 years; range 20–50) with no history of neurologic disease.
  • Imaging and analysis: 1.5-T scanner, 32 non-collinear diffusion sensitizing gradients, b = 1000 s/mm², 2.3 mm isotropic voxels; FSL probabilistic tractography (5000 streamline samples, 0.5 mm step lengths, curvature threshold = 0.2) using a seed ROI in the pontine reticular formation at the trigeminal nerve entry zone and a target ROI in the intralaminar nuclei of the thalamus at the commissural plane; FA, MD, and tract number were measured.
  • Statistics: paired t-test for right-left hemispheric differences and Pearson correlation for age associations; significance set at p < 0.05.

Limitations

  • Stated: the authors could not fully elucidate the entire ARAS because other thalamic and brainstem nuclei involved in the ARAS were not included; the reconstructed tract is described as the main portion, not the entire lower single component of the ARAS.
  • Stated: further studies are needed on the clinical usefulness of these findings and on ARAS projections from the thalamus to the cerebral cortex.
  • Evident from the text: the sample consisted only of healthy adults, so the diagnostic or prognostic value in patients with impaired consciousness was not directly tested; the study is cross-sectional and uses 1.5-T DTI.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.3389/fnhum.2013.00416

Cites

32 of 32 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Figures

Figure 1 (A) Seed regions of interest (ROI) are given on the pontine reticular formation (Red color). The target ROI is given on the intralaminar nuclei of the thalamus at the level of the commissural plane. Boundary of the intralaminar nuclei of the thalamus was defined by reference to the text book of the brain atlas (Morel, 2007). ML, medial lemniscus; RST, rubrospinal tract; RF, reticular formation; AC, anterior commissure; PC, posterior commissure. (B) Pathways of the reconstructed ascending reticular activating system are shown at each level of the brain in a normal subject (26-year-old male).
Figure 1 (A) Seed regions of interest (ROI) are given on the pontine reticular formation (Red color). The target ROI is given on the intralaminar nuclei of the thalamus at the level of the commissural plane. Boundary of the intralaminar nuclei of the thalamus was defined by reference to the text book of the brain atlas (Morel, 2007). ML, medial lemniscus; RST, rubrospinal tract; RF, reticular formation; AC, anterior commissure; PC, posterior commissure. (B) Pathways of the reconstructed ascending reticular activating system are shown at each level of the brain in a normal subject (26-year-old male).CC BY · PubMed Central

Verification

Claims the paper makes

6 Check pending · 6 No full text of the sources · 4 Own result · 2 Own interpretation · 1 Not checked yet · 1 Own method

Verify all 10 references — free account
  • It may state two separate claims as one. 6
  • Probably not a substantial claim. 7
10 of 10
  • The paper relies on this without support.

    The ARAS cannot be clearly discriminated from adjacent neural structures using conventional brain MRI, functional neuroimaging techniques, electrophysiological methods, and MR spectroscopy, making accurate identification and estimation of the ARAS in the human brain problematic.

    “However, because the ARAS cannot be clearly discriminated from adjacent neural structures, accurate identification and estimation of the ARAS in the human brain can be problematic when using these methods.”
  • The paper relies on this without support.

    The intralaminar nuclei are the main nuclei of the ARAS among the non-specific thalamic nuclei.

    “We placed the target ROI in the intralaminar nuclei, which are the main nuclei of the ARAS among the non-specific thalamic nuclei.”
  • The paper relies on this without support.

    In normal white matter, water molecules have relative freedom of movement parallel to nerve fiber tracts, but their movements are restricted across tracts, giving rise to diffusion anisotropy of white matter.

    “In normal white matter, water molecules have relative freedom of movement parallel to nerve fiber tracts. However, their movements are restricted across tracts, giving rise to diffusion anisotropy of white matter.”
  • The paper relies on this without support.

    The ARAS is composed of several neuronal circuits connecting the brainstem to the cortex.

    “The ARAS is composed of several neuronal circuits connecting the brainstem to the cortex.”
4 of 4

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Metadata

Authors
Yeo, S. S., Chang, P. H., & Jang, S. H.
Affiliations
  • Yeungnam University (KR)
  • Daegu Gyeongbuk Institute of Science and Technology (KR)
Corresponding author
Jang, Sung Ho
Venue
Frontiers in Human Neuroscience
Published
2013
Volume
7
Pages
416-416
ISSN
1662-5161 (ISSN-L)
OpenAlex
W2124163668
Cited by
162
References
35
Citations by year
2026: 9 · 2025: 7 · 2024: 5 · 2023: 13 · 2022: 13 · 2021: 18 · 2020: 20 · 2019: 15 · 2018: 17 · 2017: 13 · 2016: 14 · 2015: 14 · 2014: 4
FWCI
7.00
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Human Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Daegu Gyeongbuk Institute of Science and Technology
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Health Sciences › Medicine › Clinical Neurology › Traumatic Brain Injury Research
Keywords
ascending reticular activating system, pontine reticular formation, thalamus, intralaminar nuclei, mesencephalic tegmentum, consciousness, diffusion tensor imaging, impaired consciousness, hemispheric lateralization

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