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Laboratory Reference for Clinical Neurophysiology$
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Jay A. Liveson and Dong M. Ma

Print publication date: 1999

Print ISBN-13: 9780195129243

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195129243.001.0001

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Lumbar Plexus

Lumbar Plexus

(p.165) Chapter 6 Lumbar Plexus
Laboratory Reference for Clinical Neurophysiology

Jay A. Liveson

Dong M. Ma

Oxford University Press

The lateral femoral cutaneous nerve is formed (along with the femoral nerve) from the dorsal portions of the ventral primary divisions of the L2 and L3 roots. It is a purely sensory nerve. Its course remains deep intra-abdominally where it emerges from the lateral border of the psoas muscle to travel across the iliacus to the anterior superior iliac spine. It emerges under the lateral portion of the inguinal ligament and travels subcutaneously over or through the origin of the sartorius. The femoral nerve provides the motor innervation of the thigh extensors and the cutaneous innervation of the anteromedial thigh and the medial leg and foot. The saphenous nerve is the largest and longest branch of the femoral nerve. It is purely sensory in function, providing cutaneous innervation to the infrapatellar region, anteromedial and posteromedial leg, and medial foot to the base of the first digit.

Keywords:   ventral primary divisions, psoas muscle, iliacus, femoral nerve, saphenous nerve, cutaneous innervation, anteromedial thigh, infrapatellar region

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