Nervous
The nervous system coordinates voluntary and involuntary actions by transmitting rapid electrical and chemical impulses between the central nervous system (brain and spinal cord) and peripheral receptors/effectors.
Quantitative Metrics & Physiological Scale
Complex interconnected cortical and subcortical neurons
CN I through CN XII exiting skull bases
Segmented cervical, thoracic, lumbar, sacral, and coccygeal nerves
Fast saltatory conduction in thick myelinated A-alpha axons
Physiological Role & Homeostasis
Sensory reception, thalamocortical relay, and spatial cognition integration
Voluntary somatic motor orchestration and autonomic visceral homeostatic reflex
Higher intellectual processing, long-term memory consolidation, and consciousness
Central Nervous System (CNS) vs Peripheral Nervous System (PNS)
| Feature / 比较维度 | Central Nervous System / 中枢神经系统 | Peripheral Nervous System / 周围神经系统 |
|---|---|---|
| Anatomical Location / 解剖位置与构成 | Enclosed in cranium & vertebral canal (Brain & Spinal Cord) / 位于颅腔与椎管内（脑与脊髓） | Extends throughout the entire body periphery / 遍布全身外周（脑神经、脊神经与外周神经节） |
| Protective Structures / 骨性及被膜屏障保护 | Rigid bony casing, meninges & Blood-Brain Barrier (BBB) / 颅骨/脊柱骨壳、三层脑膜与血脑屏障 | Connective tissue sheaths (epineurium, perineurium) / 周围神经纤维结缔组织被膜（神经外膜与束膜） |
| Regeneration Capacity / 轴突受损再生潜能 | Extremely limited due to glial scarring & Nogo inhibitors / 极度受限（易形成胶质瘢痕且缺乏雪旺细胞引导） | Possible via Schwann cell regeneration pathways / 具备轴突再生可能（依靠雪旺细胞形成施万鞘管道） |
Vital Organs & Structures
How to Study This System in 3D
Rotate around the cranial base to study how the brainstem traverses the foramen magnum into the spinal cord.
Enable Skeletal system to inspect the protective relationship of the spine over segmental nerve roots.
Explore Synergistic Anatomical Systems
For educational use only; not medical advice, diagnosis, or treatment.