Tortuosity
Tortuosity - Related Videos
10:45
Real-time Iontophoresis with Tetramethylammonium to Quantify Volume Fraction and Tortuosity of Brain Extracellular Space
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Cited by 29 •
2017
This protocol describes real-time iontophoresis, a method that measures physical parameters of the extracellular space (ECS) of living brains. The diffusion of an inert molecule released into the ECS is used to calculate the ECS volume fraction and tortuosity. It is ideal for studying acute reversible changes to brain ECS.
11:29
Corneal Confocal Microscopy: A Novel Non-invasive Technique to Quantify Small Fibre Pathology in Peripheral Neuropathies
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Cited by 155 •
2011
Corneal Confocal microscopy is a non-invasive clinical technique which may be used to quantify C fibre damage to diagnose and stratify patients with increasing neuropathic severity.
10:53
Image-guided, Laser-based Fabrication of Vascular-derived Microfluidic Networks
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Cited by 10 •
2017
This protocol outlines the implementation of image-guided, laser-based hydrogel degradation to fabricate vascular-derived, biomimetic microfluidic networks embedded in poly(ethylene glycol) diacrylate (PEGDA) hydrogels. These biomimetic microfluidic systems may be useful for tissue engineering applications, generation of in vitro disease models, and fabrication of advanced "on-a-chip" devices.
09:17
Using Retinal Imaging to Study Dementia
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Cited by 19 •
2017
The retina shares prominent similarities with the brain and thus represents a unique window to study vasculature and neuronal structure in the brain non-invasively. This protocol describes a method to study dementia using retinal imaging techniques. This method can potentially aid in diagnosis and risk assessment of dementia.
16:43
Murine Spinotrapezius Model to Assess the Impact of Arteriolar Ligation on Microvascular Function and Remodeling
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Cited by 7 •
2013
We demonstrate a novel arterial ligation model in murine spinotrapezius muscle, including a step-by-step procedure and description of required instrumentation. We describe the surgery and relevant outcome measurements relating to vascular network remodeling and functional vasodilation using intravital and confocal microscopy.
FAQs
A more indirect route can reduce the efficiency of movement through neural tissue. In the nervous system, this geometric effect may influence the spread of electrical signals along cellular structures and the movement of nutrients or other molecules through tissue pathways. Interpreting tortuosity therefore helps connect structural organization with functional changes in neural communication and the tissue microenvironment.
Researchers can assess tortuosity in axons, dendrites, blood vessels, and fluid pathways. Each structure reflects a different aspect of neural organization: axons and dendrites relate to cellular connectivity, vessels relate to delivery routes, and fluid pathways relate to movement through tissue. Comparing these structures can reveal how geometry varies across brain regions, developmental stages, or pathological conditions.
Branching patterns, cellular organization, and barriers within neural tissue can make routes more indirect. These features may increase geometric complexity in neuronal processes, vascular networks, or fluid pathways. Measuring the resulting variation provides a structural way to examine how tissue architecture could affect signal conduction, nutrient movement, molecular transport, or changes in the local neural environment.
Path length reports how far a route extends, whereas tortuosity relates that route to the direct separation of its endpoints. This distinction allows researchers to separate overall scale from indirectness. Two structures may have similar endpoint distances but different tortuosity if one follows a more winding or branched course, making the measure useful for comparing geometry across samples.
The measurement begins with a representation of the relevant structure, obtained from microscopy images, tractography, or vascular measurements. Researchers then characterize the route between endpoints and compare its geometry with the corresponding direct separation. The resulting value can be used to compare regions, samples, or conditions, provided the analyzed structure is captured consistently by the chosen method.
Tortuosity is used to characterize brain development, connectivity, neurodegeneration, injury, and changes in the tissue microenvironment. It can provide a geometric indicator of altered axonal or dendritic organization, vascular structure, or fluid pathways. Because it describes structure rather than a single clinical endpoint, researchers typically interpret it alongside the specific neural system and condition being studied.
Microscopy can provide geometric information about visible cellular or vascular structures, while tractography can characterize routes associated with neural connectivity. These approaches address different structural scales and representations. Their measurements can help identify changes in organization or indirectness, but the interpretation depends on which pathway is observed and how accurately the selected method represents that pathway.
Neurodegeneration and injury can alter cellular organization, connectivity, vascular geometry, or tissue pathways. Tracking tortuosity offers a way to describe such structural changes quantitatively rather than relying only on visual inspection. The measure may therefore help researchers relate altered geometry to potential changes in electrical signaling, nutrient delivery, molecular movement, or the surrounding tissue environment.