Related Experiment Video
Updated: Feb 11, 2026
12:09
Functional and Physiological Methods of Evaluating Median Nerve Regeneration in the Rat
Published on: April 18, 2020
13.1K
Brain remodeling after chronic median nerve compression in a rat model
Bing-Bo Bao1, Dan-Qian Qu2, Hong-Yi Zhu1
1Department of Orthopedic Surgery, Shanghai Jiao Tong University, Affiliated Sixth People's Hospital, Shanghai, China.
Neural Regeneration Research
|May 4, 2018
Summary
Carpal tunnel syndrome in rats shows brain changes. Functional MRI reveals significant sensorimotor cortex remodeling at 2 weeks but not 2 months after median nerve compression.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Carpal tunnel syndrome (CTS) is a common compressive neuropathy causing sensorimotor deficits.
- Functional magnetic resonance imaging (fMRI) in CTS patients shows altered brain signals linked to neural plasticity.
- Clinical neuroimaging of the brain in CTS is challenging due to data acquisition limitations.
Purpose of the Study:
- To investigate sensory cortex remodeling in a rat model of carpal tunnel syndrome using fMRI.
- To assess brain activation patterns following peripheral nerve injury in CTS models.
Main Methods:
- A rat model of carpal tunnel syndrome was created via median nerve ligation.
- fMRI was used to compare brain activity between normal rats and CTS models at 2 weeks and 2 months post-operation.
- Electrical stimulation of paws was applied to elicit sensorimotor cortex activation.
Main Results:
- Normal rats exhibited contralateral sensorimotor cortex activation upon paw stimulation.
- CTS rats showed marked contralateral cerebral hemisphere activation (motor cortex, cerebellum, thalamus) at 2 weeks post-operation.
- This pronounced activation was absent at the 2-month follow-up in CTS rats.
Conclusions:
- Median nerve compression in rats leads to significant cerebral cortex remodeling.
- Neuroimaging reveals transient but substantial brain changes in the early stages of carpal tunnel syndrome.
- These findings highlight the dynamic nature of neural plasticity in response to peripheral nerve injury.
Related Concept Videos
02:54Nucleosome Remodeling
11.2K
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
11.2K
01:08Median
29.4K
Besides mean, the median is a widely used measure of central tendency. Typically, median is defined as the central or middle value of a data set, measured by arranging the data elements in an increasing or decreasing order. Since this middle value is not affected by the precise numerical values of the outliers or fluctuations, it is insensitive to them. Hence, in cases where a data set may have outliers or the extreme values are not known, the median is a better measure of the central tendency...
29.4K
01:20Sign Test for Median of Single Population
370
In general, the sign test serves as a nonparametric method to test hypotheses about the median of a single population when the data does not follow a known distribution. This simplicity makes it particularly useful for small sample sizes or when the assumptions of parametric tests cannot be met. The process begins with identifying a null hypothesis, typically stating that the population median equals a specific value. The alternative hypothesis could be that the median is either not equal to,...
370
01:40Bone Remodeling
40.5K
Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
40.5K
01:31Osteoclasts in Bone Remodeling
4.2K
Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
4.2K
01:23Behavior of Concrete Under Compressive Load
648
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
648