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Here is a simple trick to remember the roots of lumbar plexus roots:

"2 from 1, 2 from 2, 2 from 3"

- 2 nerves from 1 root: Ilioinguinal (L1), Iliohypogastric (L1).
- 2 nerves from 2 roots: Genitofemoral (L1,L2), Lateral Femoral (L2,L3).
- 2 nerves from 3 roots: Obturator (L2,L3,L4), Femoral (L2,L3,L4).