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相关概念视频

Indirect Motor Pathways01:22

Indirect Motor Pathways

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Equilibrium and Balance01:15

Equilibrium and Balance

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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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The Vestibular System01:29

The Vestibular System

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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance
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在反应平衡过程中,精确的皮层对传感运动反控制的贡献.

Scott Boebinger1, Aiden Payne2, Giovanni Martino3

  • 1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology & Emory University, Atlanta, Georgia, United States of America.

PLoS computational biology
|April 17, 2024
PubMed
概括

大脑皮层有助于恢复平衡,随着任务变得更具挑战性,其参与度会增加. 这项研究模拟了皮层对肌肉活动的贡献,有助于理解平衡缺陷.

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科学领域:

  • 神经科学是一个神经科学.
  • 发动机控制器的控制器
  • 生物力学 生物力学

背景情况:

  • 皮质在自动全身运动 (如行走和平衡) 中所扮演的角色尚未完全被理解.
  • 虽然皮质下电路主要调节步态和平衡,皮质则根据任务的难度进行交互.
  • 缺乏对皮层输入如何影响复杂运动期间的运动输出的机制理解.

研究的目的:

  • 研究分层控制机制与它们在反应平衡恢复任务中的参与之间的关系,这些任务在年轻人中越来越困难.
  • 测试假设,并行传感运动反循环,涉及皮层下和皮层电路,有助于平衡纠正肌肉活动.
  • 为了确定皮质电路参与是否随着平衡挑战的增加而升级.

主要方法:

  • 根据感官信息和循环延迟,将平衡纠正肌肉活动分解为假设的皮质下和皮质反组件.
  • 分析肌肉活动发作延迟,以区分皮质下和皮质感官运动循环贡献.
  • 使用脑电图 (EEG) 来测量引起的皮质活动,并将其时间与肌肉活动模式进行比较.

主要成果:

  • 最初的平衡纠正肌肉活动发生在所有难度级别,延迟时间与皮层下传感运动循环相匹配.
  • 推迟的肌肉活动爆发,据推测是皮层介导的,出现了增加的平衡任务困难,与皮层间循环延迟一致.
  • 通过EEG测量中央中线区域的唤起皮质活动,显示了与肌肉活动相似的感觉转换,但有延迟表明跨皮质循环的作用.

结论:

  • 神经机械模型可以推断皮质对肌肉活动的贡献,而无需直接记录大脑活动.
  • 在平衡控制中的皮层参与随着任务难度的增加而增加,通过皮层传感运动环介导.
  • 该模型提供了一个框架,用于评估皮质在诸如衰老和神经系统疾病 (如帕金森病) 等条件下平衡的贡献.