Assertion: lumbar plexus | /r/CapableOf | lie in psoas muscle
Facets:
value: in the posterior abdominal wall
type: LOCATION
value: alongside the lumbar vertebrae
type: LOCATION
Source sentences:
text: The upper four lumbar nerves (L1–L4) form the lumbar plexus, which lies in the psoas muscle alongside the lumbar vertebrae in the posterior abdominal wall.