Updated: 10/21/2016

Lumbosacral Plexus

Topic

Review Topic

N/A

Questions

2 2

Evidence

2 2

Videos

2 2

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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Questions (2)

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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