1 An Overview of the Lumbar Plexus 2 Subcostal Nerve 3 Iliohypogastric Nerve 4 Ilioinguinal Nerve 5 Lateral Femoral Cutaneous Nerve 6 Genitofemoral Nerve 7 Femoral Nerve 8 Obturator Nerve 9 Furcal Nerve 10 Accessory Obturator Nerve 11 Variations of the Lumbar Plexus 12 High-Resolution Magnetic Resonance Neurography of the Lumbar Plexus 13 Lesions Involving the Lumbar Plexus 14 Injury to the Lumbar Plexus Following Lateral Lumbar Spine Fusion Procedures 15 Lumbar Plexus Anatomy with Application to Lateral Approaches to the Lumbar Spine 16 The Subcostal Nerve during Lateral Approaches to the Lumbar Spine 17 Surgical Techniques for Approaching the Lumbosacral Plexus 18 Nerve Root Anomalies with Application to the Lumbar Plexus 19 Lumbar Dorsal Root Ganglia 20 History of the Dermatomes with Focus on the Contributions from the Lumbar Plexus 21 Dermatomes and the Lumbar Plexus 22 Anesthetic Blockade of the Femoral Nerve 23 Anesthetic Blockade of the Lateral Femoral Cutaneous Nerve 24 Anesthetic Blockade of the Iliohypogastric, Ilioinguinal, and Genitofemoral Nerves 25 Microanatomy of the Lumbar Plexus 26 Surgical Anatomy of the Lumbar Plexus with Emphasis on Landmarks 27 Comparative Anatomy of the Lumbar Plexus