这个词是什么意思？
A nerve which originates in the lumbar and sacral spinal cord (L4 to S3) and supplies motor and sensory innervation to the lower extremity. The sciatic nerve, which is the main continuation of the sacral plexus, is the largest nerve in the body. It has two major branches, the TIBIAL NERVE and the PERONEAL NERVE.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012584 · MeSH 2026。
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