Encyclopedia entry
Lumbosacral Trunk
Abstract
The fourth lumbar (or furcal) nerve usually contributes to both the lumbar plexus and (through the lumbosacral trunk) the sacral plexus. Contribution to the lumbosacral trunk may come from the third or the fifth lumbar nerve. Sometimes the branch from the fourth lumbar nerve to the lumbosacral plexus is absent. In such cases, the fifth lumbar nerve supplies branches to both the lumbar and sacral plexuses. Thus, contributions to both plexuses may come from the fourth lumbar nerve, the third and fourth, the fourth and fifth or the fifth lumbar nerve alone.
The fourth lumbar (or furcal) nerve usually contributes to both the lumbar plexus and (through the lumbosacral trunk) the sacral plexus.
Contribution to the lumbosacral trunk may come from the third or the fifth lumbar nerve.
Sometimes the branch from the fourth lumbar nerve to the lumbosacral plexus is absent. In such cases, the fifth lumbar nerve supplies branches to both the lumbar and sacral plexuses. Thus, contributions to both plexuses may come from the fourth lumbar nerve, the third and fourth, the fourth and fifth or the fifth lumbar nerve alone.
Riferimenti dell’opera originale
Elenco riportato come compare nella fonte, senza normalizzazione dei formati bibliografici.
- Bardeen, C.R. (1901) A statistical study of the variations in the formation and position of the lumbo-sacral plexus in man. Anat. Rec. 19:124-128, 209-232.
- Jamieson, E.B. (1903) Some anomalies in nerves arising from the lumbar plexus, and a bilaminar musculus pectineus in a foetus; and on variations in the nerve supply in man and in some other mammals. J. Anat. Physiol. 37:266-286.
- Urbanowicz, Z. (1981) Connections between the lumbar and the sacral plexus in man. Folia Morphol. (Warsaw) 40:271-279.
Anatomical classification
- Systems:
- Nervous system
Content provenance
Adaptation
Adaptation of «Lumbosacral Trunk — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» by Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Source: https://www.anatomyatlases.org/AnatomicVariants/NervousSystem/Text/LumbosacralTrunk.shtml Original work distributed under the CC BY-NC-SA 4.0 licence (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adaptation by Redazione AIVA. Changes from the original: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. This publication is not approved or endorsed by the authors of the original work.
Licence
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