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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
Cerebrospinal Fluid01:21

Cerebrospinal Fluid

Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
CSF is produced mainly in the choroid plexus, a network of capillaries and ependymal cells located within the ventricular system of the brain.
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

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Related Experiment Video

Updated: Jun 10, 2026

Flow Cytometric Analysis of Lymphocyte Infiltration in Central Nervous System during Experimental Autoimmune Encephalomyelitis
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Flow Cytometric Analysis of Lymphocyte Infiltration in Central Nervous System during Experimental Autoimmune Encephalomyelitis

Published on: November 17, 2020

Venous and cerebrospinal fluid flow in multiple sclerosis: a case-control study.

Peter Sundström1, Anders Wåhlin, Khalid Ambarki

  • 1Department of Clinical Neuroscience, Umeå University, Sweden.

Annals of Neurology
|August 10, 2010
PubMed
Summary

This study investigated the chronic cerebrospinal venous insufficiency hypothesis for multiple sclerosis. Researchers found no significant differences in venous outflow or cerebrospinal fluid flow between MS patients and controls, challenging the vascular MS theory.

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Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo
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Last Updated: Jun 10, 2026

Flow Cytometric Analysis of Lymphocyte Infiltration in Central Nervous System during Experimental Autoimmune Encephalomyelitis
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Published on: November 17, 2020

Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo
06:24

Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo

Published on: July 8, 2025

Area of Science:

  • Neurology
  • Vascular Biology
  • Neuroimaging

Background:

  • The etiopathogenesis of multiple sclerosis (MS) is debated, with a recent hypothesis suggesting chronic cerebrospinal venous insufficiency (CCSVI) as a potential cause.
  • This study aimed to evaluate the validity of the CCSVI hypothesis in patients with relapsing-remitting MS.

Observation:

  • The study involved 21 relapsing-remitting MS patients and 20 healthy controls.
  • Phase-contrast magnetic resonance imaging (PC-MRI) was used to assess internal jugular venous outflow and aqueductal cerebrospinal fluid (CSF) flow.
  • Contrast-enhanced magnetic resonance angiography (CE-MRA) was performed on MS patients.

Findings:

  • No significant differences were observed in internal jugular venous outflow between MS patients and controls.
  • Aqueductal cerebrospinal fluid flow did not differ between the groups.
  • The presence of internal jugular blood reflux was similar in both MS patients and controls.
  • Stenoses in the internal jugular vein were identified in only three out of 21 MS cases.

Implications:

  • The findings do not support the proposed link between CCSVI and the etiopathogenesis of relapsing-remitting MS.
  • The results suggest that vascular factors, as defined by CCSVI, may not play a primary role in this form of MS.
  • Further research is needed to explore other potential etiological factors in multiple sclerosis.