Corticospinal Tract
Corticospinal Tract - Related Videos
09:10
Determining the Functional Status of the Corticospinal Tract Within One Week of Stroke
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Cited by 1 •
2020
This protocol is for evaluating corticospinal tract function within 1 week of stroke. It can be used to select and stratify patients in trials of interventions designed to improve upper limb motor recovery and outcomes and in clinical practice for predicting upper limb functional outcomes 3 months after stroke.
05:36
Assessing Corticospinal Pathways Using Transcranial Magnetic Stimulation
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2025
Source: Charalambos, C. C., et al. Bilateral Assessment of the Corticospinal Pathways of the Ankle Muscles Using Navigated Transcranial Magnetic Stimulation. J. Vis. Exp. (2019)This video demonstrates the method to assess corticospinal pathways of the leg muscles using transcranial magnetic stimulation (TMS). Rest and active muscle responses are recorded from one brain hemisphere to evaluate the contralateral corticomotor function of leg muscles.
08:41
Unilateral Pyramidotomy of the Corticospinal Tract in Rats for Assessment of Neuroplasticity-inducing Therapies
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Cited by 21 •
2014
The corticospinal tract, one of the major sensorimotor tracts, can be lesioned unilaterally in the rodent brainstem in order to test neuroplasticity-inducing therapies for the central nervous system. This surgical procedure (“pyramidotomy”) and postoperative assessments are described in this protocol.
12:33
Corticospinal Excitability Modulation During Action Observation
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Cited by 22 •
2013
Single-pulse transcranial magnetic stimulation over the primary motor cortex, neuronavigation, and registration of electromyographic activity of hand muscles were used in this study to explore corticospinal excitability while participants were observing action sequences.
02:32
Targeted Viral Delivery to Corticospinal Neurons in a Neonatal Rat to Study Spinal Cord Injury
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2025
Source: Smit, R. D., et al. Targeting the Corticospinal Tract in Neonatal Rats with a Double-Viral Vector using Combined Brain and Spine Surgery. J. Vis. Exp. (2021)This video demonstrates the targeted delivery of viral vectors to corticospinal neurons in a neonatal rat. The protocol enables precise gene expression using anterograde and retrograde viral injections, facilitating research on neural regeneration and plasticity following spinal cord injury.
FAQs
Most corticospinal fibers cross at the medullary pyramids before descending into the spinal cord. This anatomical transition is important because clinicians must consider where a lesion lies relative to the crossing when relating an injury to weakness or other motor abnormalities. The crossing therefore contributes to the characteristic patterns used during neurological localization.
Corticospinal signals influence spinal motor neurons through interneurons rather than acting only as a simple direct command line. These intermediary cells help connect descending cortical activity with spinal motor output, allowing signals to affect movement-related circuits. Their involvement is especially relevant when interpreting how cortical injury can produce weakness and impaired skilled limb control.
The primary motor cortex provides the main cortical origin identified for corticospinal signals. Its position at the start of the pathway links cortical motor planning and command generation with descending control of the spinal cord. Damage affecting this origin can therefore disrupt voluntary movement, particularly the skilled limb actions that depend on precise motor control.
Clinicians use the tract's predictable route from cerebral cortex through the brainstem to the spinal cord when interpreting motor findings. The location of weakness, altered reflexes, and characteristic impairment patterns can be considered alongside this route to estimate where injury may have occurred. This anatomical reasoning helps distinguish brain and spinal cord involvement during examination.
Assessment commonly considers weakness, changes in reflexes, and recognizable patterns of motor impairment. These findings do not stand alone; their distribution is interpreted in relation to the tract's anatomy and crossing in the medulla. Together, they can help clinicians identify whether a brain or spinal cord injury has affected descending motor control.
Understanding the pathway helps clinicians relate the site and apparent extent of motor-system injury to expected functional consequences. Examination findings can provide information about weakness and reflex changes, while tract anatomy offers context for interpreting the pattern. This combination supports prognosis, including clinical judgments about likely motor impairment and recovery needs.
The corticospinal tract provides an anatomical framework for studying motor recovery after brain or spinal cord injury. Researchers can relate changes in voluntary movement and skilled limb control to disruption or recovery within descending motor pathways. This connection helps place rehabilitation outcomes in a neurological context and supports investigation of how motor function may improve after injury.