Encyclopedia entry

Lumbosacral Trunk

Version 1

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

Translation

Italian translation 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). Translation by Redazione AIVA. Changes from the original: Traduzione italiana del testo originale inglese, che resta consultabile nella versione inglese di questa pagina. Il contenuto è stato riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti) senza modificarne le affermazioni. 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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