This one I found rather useful during this past lab practical.
The Lumbar Plexus:
Lumbar plexus "I, I Get Laid On Fridays":
Iliohypogastric [L1]
Ilioinguinal [L1]
Genitofemoral [L1, L2]
Lateral femoral cutaneous [L2, L3]
Obtruator [L2, L3, L4]
Femoral [L2, L3, L4]
Again, pardon if the pneumonics for being rather obtuse. This is actually a mneumonic our professors introduced to us, lol.

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