|Nerve: Lumbar nerves|
|Areas of distribution of the cutaneous branches of the posterior divisions of the spinal nerves. The areas of the medial branches are in black, those of the lateral in red.|
|Plan of lumbar plexus.|
|Gray's||subject #209 924|
The medial branches of the posterior divisions of the lumbar nerves run close to the articular processes of the vertebræ and end in the Multifidus.
The lateral branches supply the Sacrospinalis.
The upper three give off cutaneous nerves which pierce the aponeurosis of the Latissimus dorsi at the lateral border of the Sacrospinalis and descend across the posterior part of the iliac crest to the skin of the buttock, some of their twigs running as far as the level of the greater trochanter.
The anterior divisions of the lumbar nerves (rami anteriores) increase in size from above downward.
The first and second, and sometimes the third and fourth lumbar nerves are each connected with the lumbar part of the sympathetic trunk by a white ramus communicans.
The first three and the greater part of the fourth are connected together in this situation by anastomotic loops, and form the lumbar plexus.
The fourth nerve is named the nervus furcalis, from the fact that it is subdivided between the two plexuses.
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 As such, some of the information contained herein may be outdated.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
|Cervical (8)||anterior (Cervical plexus, Brachial plexus) - posterior (Posterior branches of cervical nerves, Suboccipital, Greater occipital, Third occipital)|
|Thoracic (12)||anterior (Intercostal, Intercostobrachial - T2, Thoraco-abdominal nerves - T7-T11, Subcostal - T12) - posterior (Posterior branches of thoracic nerves)|
|Lumbar (5)||anterior (Lumbar plexus, Lumbosacral trunk) - posterior (Posterior branches of the lumbar nerves, Superior cluneal L1-L3)|
|Sacral (5)||anterior (Sacral plexus) - posterior (Posterior branches of sacral nerves, Medial cluneal nerves)|
|Coccygeal (1)||anterior (Coccygeal plexus) - posterior (Posterior branch of coccygeal nerve)|
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