Updated: 10/21/2016

Lumbosacral Plexus

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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
  • 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
  • Tibia 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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(OBQ09.30) A patient is undergoing percutaneous iliosacral screw fixation for a sacroiliac joint diastasis. The proposed screw trajectory into the S1 body is represented by the red star on the drawing of the sacrum in Figure A. What is the most common strength deficit sequela of this proposed screw trajectory? Review Topic | Tested Concept

QID: 2843
FIGURES:
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1

Loss of hip flexion

2%

(85/3429)

2

Loss of knee extension

1%

(46/3429)

3

Loss of ankle dorsiflexion

7%

(233/3429)

4

Loss of great toe extension

81%

(2790/3429)

5

Loss of ankle plantar flexion

8%

(259/3429)

L 1 C

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Topic COMMENTS (4)

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