open access

Vol 75, No 3 (2016)
ORIGINAL ARTICLES
Published online: 2015-12-22
Submitted: 2015-07-30
Accepted: 2015-09-20
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Lumbosacral plexus in Brazilian Common Opossum

R. Senos, M. S. Ribeiro, H. G. Benedicto, J. R. Kfoury Júnior
DOI: 10.5603/FM.a2015.0131
·
Pubmed: 26711655
·
Folia Morphol 2016;75(3):300-305.

open access

Vol 75, No 3 (2016)
ORIGINAL ARTICLES
Published online: 2015-12-22
Submitted: 2015-07-30
Accepted: 2015-09-20

Abstract

The opossum has been suggested as an animal model for biomedical studies due to its adaptability to captivity and number of births per year. Despite many studies on morphology and experimental neurology using this opossum model, the literature does not offer details of the nerves of the lumbosacral plexus in this species. Ten lumbosacral plexus were dissected to describe the peripheral innervations of the Brazilian Common Opossum (Didelphis aurita) and compare the results with Eutheria clade species. The tensor fasciae latae muscle was absent and there was only one sartorius muscle for each limb. The distribution of the nerves were similar to other mammals, except for the caudal gluteal nerve, sartorius muscle innervations and the position of the pudendal nerve which arose from the major ischiatic foramen together with the ischiatic nerve, the cranial gluteal nerve and the caudal gluteal nerve. No anatomical variation was found. The special position of the pudendal nerve suggested that the Brazilian Common Opossum is a better model than rats or rabbits in surgical procedures with that specific nerve. In addition, the study revealed that the pelvic limb nerves are not an invariable structure of reference for muscle homology and homonym as reported previously. New investigation using other species of opossums are necessary to best comprehend the lumbosacral plexus distribution in the Methatheria clade and to confirm that other opossum species is eligible as a good model for pudendal nerve studies.

Abstract

The opossum has been suggested as an animal model for biomedical studies due to its adaptability to captivity and number of births per year. Despite many studies on morphology and experimental neurology using this opossum model, the literature does not offer details of the nerves of the lumbosacral plexus in this species. Ten lumbosacral plexus were dissected to describe the peripheral innervations of the Brazilian Common Opossum (Didelphis aurita) and compare the results with Eutheria clade species. The tensor fasciae latae muscle was absent and there was only one sartorius muscle for each limb. The distribution of the nerves were similar to other mammals, except for the caudal gluteal nerve, sartorius muscle innervations and the position of the pudendal nerve which arose from the major ischiatic foramen together with the ischiatic nerve, the cranial gluteal nerve and the caudal gluteal nerve. No anatomical variation was found. The special position of the pudendal nerve suggested that the Brazilian Common Opossum is a better model than rats or rabbits in surgical procedures with that specific nerve. In addition, the study revealed that the pelvic limb nerves are not an invariable structure of reference for muscle homology and homonym as reported previously. New investigation using other species of opossums are necessary to best comprehend the lumbosacral plexus distribution in the Methatheria clade and to confirm that other opossum species is eligible as a good model for pudendal nerve studies.

Get Citation

Keywords

anatomy, black-eared opossum, ischiatic, nerve, nervous system, pelvic limb

About this article
Title

Lumbosacral plexus in Brazilian Common Opossum

Journal

Folia Morphologica

Issue

Vol 75, No 3 (2016)

Pages

300-305

Published online

2015-12-22

DOI

10.5603/FM.a2015.0131

Pubmed

26711655

Bibliographic record

Folia Morphol 2016;75(3):300-305.

Keywords

anatomy
black-eared opossum
ischiatic
nerve
nervous system
pelvic limb

Authors

R. Senos
M. S. Ribeiro
H. G. Benedicto
J. R. Kfoury Júnior

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