Anatomy of Lumbar Plexus 

Lumbar Plexus Formed by ventral rami of L1, L2, L3 and part of L4.

These rami of the Lumbar Plexus divide into Two Division 

• 1. Dorsal Division
• 2. Ventral Divisions.

From the ventral divisions of the Lumbar Plexus give rise to 

• ilioinguinal (L1), 
• genitofemoral (L1, L2), 
• obturator(L2,L3, L4), 
• accessory obturator (L3,L4) nerves.

The dorsal divisions of these rami of Lumbar Plexus give rise to 

• lateral cutaneous nerve of thigh (L2, L3)
• femoral nerve (L2,L3,L4)

Iliohypogastric contains fibres of both ventral and dorsal divisions (L1)

Lumbar Plexus Diagram