Assertion: sciatic nerve | /r/HasProperty | formed in lower spine
Facets:
value: to s3 nerve roots
type: LOCATION
value: by the union of l4
type: OTHER
Source sentences:
text: The sciatic nerve is formed in the lower spine by the union of L4 to S3 nerve roots and exits the pelvis through the greater sciatic foramen, below the piriformis muscle (deep in the buttock).