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来自楔外核和颈髓中央核至小脑的感觉输入对前肢运动进行精细调节。

The Sensory Input from the External Cuneate Nucleus and Central Cervical Nucleus to the Cerebellum Refines Forelimb Movements.

作者信息

Eneanya Chidubem, Smith George M

机构信息

Department of Neural Sciences, Lewis Katz School of Medicine, Temple University, 3500 North Broad Street, Philadelphia, PA 19140, USA.

出版信息

Cells. 2025 Apr 13;14(8):589. doi: 10.3390/cells14080589.

Abstract

Goal-directed reaching movements are extremely accurate to the point that the location, placement, and speed of the limbs are specific from trial to trial. These movements require descending motor commands and feedback modulation from ascending sensory information. The descending motor commands and ascending sensory information work in conjunction to ensure that the movement is accurate and precise through an error-corrected process that resides in the cerebellum. Disruptions to this information may cause errors in the precision of forelimb motor targeting. According to the previous literature, the external cuneate nucleus (ECN) and central cervical nucleus (CeCv) are responsible for conveying unconscious sensory information from the forelimbs, shoulders, and neck muscles to the cerebellum. Here, we examined the significance of the ECN and CeCv, separately, in forelimb function. In conjunction with inhibitory DREADDs (hM4Di), we observed an obstruction in single pellet reaching and grasping when ECN activity was repressed, both unilaterally and bilaterally, in normal rats. We also observed reduced reach in the grooming assessment bilaterally. We discovered that the CeCv terminates in the medial cerebellar nucleus (MCN), within the deep cerebellar nuclei (DCN), which, to the best of our knowledge, was previously not clearly defined. Together, this information provides evidence that the requirement of ascending sensory information is important in forelimb function.

摘要

目标导向的伸手动作极其精确,以至于每次试验中肢体的位置、放置和速度都是特定的。这些动作需要下行运动指令和来自上行感觉信息的反馈调制。下行运动指令和上行感觉信息协同工作,通过小脑的误差校正过程确保动作准确无误。对这些信息的干扰可能会导致前肢运动目标精度出现误差。根据先前的文献,外侧楔核(ECN)和颈中央核(CeCv)负责将来自前肢、肩部和颈部肌肉的无意识感觉信息传递至小脑。在此,我们分别研究了ECN和CeCv在前肢功能中的重要性。结合抑制性双特异性设计药物(hM4Di),我们观察到,在正常大鼠中,单侧和双侧抑制ECN活动时,单次抓取小球及抓握均受阻。我们还观察到双侧在梳理评估中的伸展减少。我们发现,CeCv终止于小脑深部核团(DCN)内的内侧小脑核(MCN),据我们所知,此前对此并未明确界定。总之,这些信息提供了证据,表明上行感觉信息的需求在前肢功能中很重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/376d/12025734/6a5a56eb280d/cells-14-00589-g001.jpg

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