Updated: 11/23/2015

Lumbosacral plexus

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drawing

 
Anatomy
  • Ventral rami from T12-S3
  • Found on the anterior surface of the quadratus lumborum and lies posterior to the psoas muscle
  • Sciatic nerve composed of L4-S3
    • peroneal division more lateral than the tibial division
  • NAVAL: within the triangle, from a lateral to medial direction, are the femoral Nerve, Artery, and Vein, and the Lymphatic vessels
  • POP'S IQ: nerves exiting below piriformis are : Pudendal, Obturator internus, Postfemoral cutaneous, Sciatic, Inferior gluteal, Quadratus femoris
  • L5 nerve root endangered during percutaneous iliosacral screw placement

Name

Nerves

Muscles Supplied

Superior gluteal

L4-S1

Gluteus medius and minimus/tensor fascia lata

Quadratus femoris

L4-S1

Quadratus femoris/inferior gemellus

Peroneal

 

L4-S2

Biceps (short head)/tibialis anterior/extensor digitorum longus/peroneus tertius/extensor hallucis longus; peroneus longus and brevis/extensor hallucis brevis/extensor digitorum brevis

Tibial

 

L4-S3

Semimembranosus/semitendinosus/biceps (long head)/adductor magnus/gastrocnemius/soleus/plantaris/popliteus/tibialis posterior/flexor digitorum longus/flexor hallucis longus

Obturator internus

L5-S2

Obturatorius internus/superior gemellus

Inferior gluteal

L5-S2

Gluteus maximus

Posterior femoral cutaneous

S1-S3

Sensory: posterior thigh

 

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