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Related Concept Videos

Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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The spinal cord is the body’s major nerve tract of the central nervous system, communicating afferent sensory information from the periphery to the brain and efferent motor information from the brain to the body. The human spinal cord extends from the hole at the base of the skull, or foramen magnum, to the level of the first or second lumbar vertebra.
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The spinal cord, a critical component of the central nervous system, extends from the base of the brainstem to the lumbar region of the vertebral column. It is essential for maintaining physical stability and facilitating communication between the brain and peripheral parts of the body.
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The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
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Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...
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Secondary Spinal Cord Injury llI: Pathophysiology01:25

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Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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Measuring Spinal Presynaptic Inhibition in Mice By Dorsal Root Potential Recording In Vivo
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Inhibition downunder: an update from the spinal cord.

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Spinal cord inhibitory neurons are crucial for processing sensory information and controlling movements. Researchers are using advanced genetic and optogenetic tools to understand how these neurons develop and function in sensorimotor circuits.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cell Biology

Background:

  • Inhibitory neurons in the spinal cord are essential for sensorimotor functions.
  • These neurons regulate reflexes, locomotion, and skilled movements like grasping.

Purpose of the Study:

  • To understand the specification and integration of inhibitory neuron types into spinal cord circuitry.
  • To characterize molecularly defined inhibitory neuron populations.
  • To investigate the functional roles of these neurons in sensory processing and motor behaviors.

Main Methods:

  • Utilizing molecular genetic techniques to define inhibitory neuron subtypes.
  • Employing optogenetics to manipulate neuronal activity.
  • Combining these with neuroanatomical, electrophysiological, and behavioral analyses.

Main Results:

  • Significant advancements in identifying and characterizing distinct inhibitory neuron populations.
  • Demonstration of the functional contributions of specific inhibitory neurons to motor tasks.
  • Progress in understanding how these cells are integrated into sensorimotor pathways.

Conclusions:

  • Molecular and optogenetic tools are rapidly advancing our understanding of spinal cord inhibitory circuits.
  • These neurons play critical roles in diverse motor behaviors and sensory processing.
  • Further research promises deeper insights into neural circuit function and motor control.