Lumbar plexus
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| Nerve: Lumbar plexus | |
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| Plan of lumbar plexus. | |
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| The lumbar plexus and its branches. | |
| Latin | plexus lumbalis |
| Gray's | subject #212 949 |
| From | L1-L4 |
| MeSH | Lumbosacral+Plexus |
| Dorlands / Elsevier | p_24/12648073 |
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WikiDoc Resources for Lumbar plexus | |
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Most recent articles on Lumbar plexus Most cited articles on Lumbar plexus | |
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Powerpoint slides on Lumbar plexus | |
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Evidence Based Medicine | |
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Clinical Trials | |
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Ongoing Trials on Lumbar plexus at Clinical Trials.gov Trial results on Lumbar plexus Clinical Trials on Lumbar plexus at Google
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Guidelines / Policies / Govt | |
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US National Guidelines Clearinghouse on Lumbar plexus NICE Guidance on Lumbar plexus
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Patient resources on Lumbar plexus Discussion groups on Lumbar plexus Patient Handouts on Lumbar plexus Directions to Hospitals Treating Lumbar plexus Risk calculators and risk factors for Lumbar plexus
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Causes & Risk Factors for Lumbar plexus | |
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Overview
The lumbar plexus is a nervous plexus in the lumbar region of the body. It is formed by the loops of communication between the anterior divisions of the first three and the greater part of the fourth lumbar nerves; the first lumbar often receives a branch from the last thoracic nerve.
It is situated in the posterior part of the Psoas major, in front of the transverse processes of the lumbar vertebræ.
The mode in which the plexus is arranged varies in different subjects.
Branches
The lumbar plexus differs from the brachial plexus in not forming an intricate interlacement, but the several nerves of distribution arise from one or more of the spinal nerves, in the following manner: the first lumbar nerve, frequently supplemented by a twig from the last thoracic, splits into an upper and lower branch; the upper and larger branch divides into the iliohypogastric and ilioinguinal nerves; the lower and smaller branch unites with a branch of the second lumbar to form the genitofemoral nerve.
The remainder of the second lumbar nerve, and the third and fourth lumbar nerves, divide into ventral and dorsal divisions.
The ventral division of the second lumbar nerve unites with the ventral divisions of the third and fourth lumbar nerves to form the obturator nerve.
The dorsal divisions of the second and third nerves divide into two branches, a smaller branch from each uniting to form the lateral femoral cutaneous nerve, and a larger branch from each joining with the dorsal division of the fourth nerve to form the femoral nerve.
The accessory obturator, when it exists, is formed by the union of two small branches given off from the third and fourth nerves.
Mnemonic
One mnemonic used to remember this is "Interested in getting laid (or lunch) on Friday, Larry?"
| Division | Name | Source | Target |
| Main | Iliohypogastric nerve | 1 L. | Skin over the lateral gluteal region and above the pubis [1] |
| Main | Ilioinguinal nerve | 1 L. | Skin over the root of the penis and upper part of the scrotum (male), skin covering the mons pubis and labium majus (female) |
| Main | Genitofemoral nerve | 1, 2 L. | Genital Branch: Cremaster muscle, skin of scrotum/labia majora Femoral Branch: Skin on anterior thigh |
| Dorsal | Lateral femoral cutaneous | 2, 3 L. | Skin on the lateral part of the thigh |
| Ventral | Obturator nerve (and Accessory obturator nerve, when present) | 2, 3, 4 L. | Medial compartment of thigh |
| Dorsal | Femoral nerve | 2, 3, 4 L. | Anterior compartment of thigh |
| Ventral | Lumbosacral trunk | 4, 5L., 1, 2, 3, 4 S. | Sacral plexus |
Additional images
 The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses. |
References
External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
Nerves: spinal nerves | |
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| Cervical (8) | C1, C2, C3, C4, C5, C6, C7, C8
anterior (Cervical plexus, Brachial plexus) - posterior (Posterior branches of cervical nerves, Suboccipital - C1, Greater occipital - C2, Third occipital - C3) |
| Thoracic (12) | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12
anterior (Intercostal, Intercostobrachial - T2, Thoraco-abdominal nerves - T7-T11, Subcostal - T12) - posterior (Posterior branches of thoracic nerves) |
| Lumbar (5) | L1, L2, L3, L4, L5
anterior (Lumbar plexus, Lumbosacral trunk) - posterior (Posterior branches of the lumbar nerves, Superior cluneal L1-L3) |
| Sacral (5) | S1, S2, S3, S4, S5
anterior (Sacral plexus) - posterior (Posterior branches of sacral nerves, Medial cluneal nerves) |
| Coccygeal (1) | anterior (Coccygeal plexus) - posterior (Posterior branch of coccygeal nerve) |
WikiDoc Research Resources for Lumbar plexus | |
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| Articles on Lumbar plexus | Most recent articles on Lumbar plexus • Most cited articles on Lumbar plexus • Review articles on Lumbar plexus • Articles on Lumbar plexus in N Eng J Med, Lancet, BMJ |
| Media (Slides, Video, Images, MP3) on Lumbar plexus | Powerpoint slides on Lumbar plexus • Images of Lumbar plexus • Photos of Lumbar plexus • Podcasts & MP3s on Lumbar plexus • Videos on Lumbar plexus |
| Evidence Based Medicine Regarding Lumbar plexus | Cochrane Collaboration on Lumbar plexus • Bandolier on Lumbar plexus • TRIP on Lumbar plexus |
| Cost Effectiveness of Lumbar plexus | Cost Effectiveness of Lumbar plexus |
| Clinical Trials Involving Lumbar plexus | Ongoing Trials on Lumbar plexus at Clinical Trials.gov • Trial results on Lumbar plexus • Clinical Trials on Lumbar plexus at Google |
| Guidelines / Policies / Government Resources (FDA/CDC) Regarding Lumbar plexus | US National Guidelines Clearinghouse on Lumbar plexus • NICE Guidance on Lumbar plexus • NHS PRODIGY Guidance • FDA on Lumbar plexus • CDC on Lumbar plexus |
| Textbook Information on Lumbar plexus | Books and Textbook Information on Lumbar plexus |
| Pharmacology Resources on Lumbar plexus | Dosing of Lumbar plexus • Drug interactions with Lumbar plexus • Side effects of Lumbar plexus • Allergic reactions to Lumbar plexus • Overdose information on Lumbar plexus • Carcinogenicity information on Lumbar plexus • Lumbar plexus in pregnancy • Pharmacokinetics of Lumbar plexus • |
| Genetics, Pharmacogenomics, and Proteinomics of Lumbar plexus | Genetics of Lumbar plexus • Pharmacogenomics of Lumbar plexus • Proteomics of Lumbar plexus |
| Newstories on Lumbar plexus | Lumbar plexus in the news • Be alerted to news on Lumbar plexus • News trends on Lumbar plexus |
| Commentary on Lumbar plexus | Blogs on Lumbar plexus |
| Patient Resources on Lumbar plexus | Patient resources on Lumbar plexus • Discussion groups on Lumbar plexus • Patient Handouts on Lumbar plexus • Directions to Hospitals Treating Lumbar plexus • Risk calculators and risk factors for Lumbar plexus |
| Healthcare Provider Resources on Lumbar plexus | Symptoms of Lumbar plexus • Causes & Risk Factors for Lumbar plexus • Diagnostic studies for Lumbar plexus • Treatment of Lumbar plexus |
| Continuing Medical Education (CME) Programs on Lumbar plexus | CME Programs on Lumbar plexus |
| International Resources on Lumbar plexus | Lumbar plexus en Espanol • Lumbar plexus en Francais |
| Business Resources on Lumbar plexus | Lumbar plexus in the Marketplace • Patents on Lumbar plexus |
| Informatics Resources on Lumbar plexus | List of terms related to Lumbar plexus |
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
