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Encyclopedia > Lumbar plexus
Nerve: Lumbar plexus
Plan of lumbar plexus.
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

The lumbar plexus 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. Image File history File links Gray822. ... Image File history File links Gray823. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... The formation of the spinal nerve from the dorsal and ventral roots Grays Fig. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo. ... The ventral ramus (anterior ramus, anterior branch, anterior divisions of the spinal nerves) supply the antero-lateral parts of the trunk, and the limbs; they are for the most part larger than the posterior divisions. ... The formation of the spinal nerve from the dorsal and ventral roots Grays Fig. ... The term spinal nerve generally refers to the mixed spinal nerve, which is formed from the dorsal and ventral roots that come out of the spinal cord. ...


It is situated in the posterior part of the Psoas major, in front of the transverse processes of the lumbar vertebræ. The psoas major is a muscle of the human abdomen. ... A typical lumbar vertebra The lumbar vertebrae are the largest segments of the movable part of the vertebral column, and can be distinguished by the absence of a foramen (hole) in the transverse process, and by the absence of facets on the sides of the body. ...


The mode in which the plexus is arranged varies in different subjects. PLEXUS (Physics Learning EXperience Using Software) is a name of project that was started by Vibor Cipan, physics student form Croatia and it is based on utilization of usage of computer technology to enhance learning of physics. ...


It 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 Iliohypogastric Nerve is the superior branch of the anterior ramus of spinal nerve L1 (one of the lumbar nerves) after this nerve receives fibers from T12(subcostal nerve). ... The ilioinguinal nerve, smaller than the iliohypogastric nerve, arises with it from the first lumbar nerve. ... In human anatomy, the genitofemoral nerve originates from the upper part of the lumbar plexus of spinal nerves. ...


The remainder of the second nerve, and the third and fourth nerves, divide into ventral and dorsal divisions.


The ventral division of the second unites with the ventral divisions of the third and fourth 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 Lateral Femoral Cutaneous Nerve (external cutaneous nerve) arises from the dorsal divisions of the second and third lumbar nerves. ...


The accessory obturator, when it exists, is formed by the union of two small branches given off from the third and fourth nerves.

Contents

Branches

The branches of the lumbar plexus may therefore be arranged as follows:

Division Name Source
Main Iliohypogastric nerve 1 L.
Main Ilioinguinal nerve 1 L.
Main Genitofemoral nerve 1, 2 L.
Dorsal Lateral femoral cutaneous 2, 3 L.
Ventral Obturator nerve (and Accessory obturator nerve, when present) 2, 3, 4 L.
Dorsal Femoral nerve 2, 3, 4 L.
Ventral Lumbosacral trunk 4, 5L., 1, 2, 3, 4 S.

The Iliohypogastric Nerve arises from the first lumbar nerve. ... The Ilioinguinal Nerve, smaller than the Iliohypogastric nerve, arises with it from the first lumbar nerve. ... In human anatomy, the genitofemoral nerve originates from the upper part of the lumbar plexus of spinal nerves. ... The lateral cutaneous nerve of the thigh (also called the lateral femoral cutaneous nerve) is a cutaneous nerve that innervates the skin on the lateral part of the thigh. ... The Obturator Nerve arises from the ventral divisions of the second, third, and fourth lumbar nerves; the branch from the third is the largest, while that from the second is often very small. ... The Accessory Obturator Nerve is present in about 29 per cent. ... The femoral nerve, the largest branch of the lumbar plexus, arises from the dorsal divisions of the second, third, and fourth lumbar nerves. ... The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus. ...

Mnemonic

One mnemonic used to remember this is "Interested in getting laid (or lunch) on Friday, "L"arry?"


Additional images

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. Duke University is a private coeducational research university located in Durham, North Carolina, USA. Founded by Methodists and Quakers in the present-day town of Trinity in 1838, the school moved to Durham in 1892. ... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body (or Grays Anatomy as it has more commonly become known) is an anatomy textbook widely regarded as a classic work on human anatomy. ...


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