Lumbar Plexus

LOMBAR PLEXO

This plexus is located in the posterior part of the psoas major muscle, anterior to the transverse processes of the lumbar vertebrae. It is formed by the ventral branches of the first three lumbar nerves and most of the fourth lumbar nerve (L1, L2, L3 and L4) and an anastomotic branch of T12, giving a branch to the sacral plexus.

L1 receives the anastomotic branch of T12 and then provides three branches that are the Iliohypogastric nerve, The Ilio-inguinal Nerve and the Superior Root of the Genitofemoral Nerve.

L2 trifurcates giving the lower root of the Genitofemoral Nerve, a Upper Root of Thigh Lateral Cutaneous Nerve and the Superior Root of Femoral Nerve.

LOMBAR PLEXO

L3 grants the Lower Root of Thigh Lateral Skin Nerve, a Middle Femoral Nerve Root and the Superior Root of the obturator nerve.

L4 provides the anastomotic branch to L5 and then forks giving the Lower Femoral Nerve Root and the Root Inferior obturator nerve.

LOMBAR PLEXO
 
PLEXO LOMBAR - Scheme
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
LOMBAR PLEXO
LOMBAR PLEXO

 
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
SHOCK NERVE
 
SHOCK NERVE
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
FEMORAL AND SIDE CUTANEUM NERVE OF THIGH
 
FEMORAL AND SIDE CUTANEUM NERVE OF THIGH
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.