感觉/
上行径路
上行径路
1°:
2°:
- → sensory decussation/arcuate fibers (Posterior external arcuate fibers、Internal arcuate fibers) → Medial lemniscus/Trigeminal lemniscus → 丘脑 (VPL、VPM)
3°:
快速径路/外侧
- 1° (Free nerve ending → A delta fiber) → 2° (Anterior white commissure → Lateral and Anterior 脊髓丘脑束 → 脊髓丘脑束 → VPL of 丘脑) → 3° (中央后回) → 4° (Posterior parietal cortex)
2° (Spinomesencephalic tract → Superior colliculus of Midbrain tectum)
慢速径路/内侧
- 1° (Group C nerve fiber → Spinoreticular tract → Reticular formation) → 2° (丘脑内腹核) → 3° (扣带皮层)
运动/
下行径路
下行径路
锥体径
- flexion: 初级运动皮层 → Posterior limb of internal capsule → Decussation of pyramids → 皮质脊髓径 (Lateral, Anterior) → 神经肌肉接点
direct:
1° (运动皮层 → 纹状体) → 2° (GPi) → 3° (Lenticular fasciculus/Ansa lenticularis → Thalamic fasciculus → VL of 丘脑) → 4° (Thalamocortical radiations → Supplementary motor area) → 5° (运动皮层)
indirect:
1° (运动皮层 → 纹状体) → 2° (GPe) → 3° (Subthalamic fasciculus → Subthalamic nucleus) → 4° (Subthalamic fasciculus → GPi) → 5° (Lenticular fasciculus/Ansa lenticularis → Thalamic fasciculus → VL of 丘脑) → 6° (Thalamocortical radiations → Supplementary motor area) → 7° (运动皮层)
Afferent
- 下橄榄核 → Olivocerebellar tract → ICP → Hemisphere → Purkinje cell → 小脑深部核团
Efferent
- Dentate nucleus in Lateral hemisphere/pontocerebellum → SCP → Dentatothalamic tract → 丘脑 (VL) → 运动皮层
Bidirectional:
Spinocerebellar
Spinocerebellar
- lower limb → 1° (muscle spindles → DRG) → 2° (Posterior thoracic nucleus → Dorsal/posterior spinocerebellar tract → ICP → 小脑蚓部)
- 上肢 → 1° (muscle spindles → DRG) → 2° (Accessory cuneate nucleus → Cuneocerebellar tract → ICP → Anterior lobe of cerebellum)
- lower limb → 1° (Golgi tendon organ) → 2° (Ventral/anterior spinocerebellar tract→ SCP → 蚓部)
- upper limb → 1° (Golgi tendon organ) → 2° (Rostral spinocerebellar tract → ICP → 小脑)
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