Resumo

MARTINEZ-PEREIRA, M A  e  RICKES, E M. The spinal nerves that constitute the lumbosacral plexus and their distribution in the chinchilla. J. S. Afr. Vet. Assoc. [online]. 2011, vol.82, n.3, pp.150-154. ISSN 2224-9435.

In this study, the spinal nerves that constitute the lumbosacral plexus (plexus lumbosacrales) (LSP) and its distribution in Chinchilla lanigera were investigated. Ten chinchillas (6 males and 4 females) were used in this research. The spinal nerves that constitute the LSP were dissected and the distribution of pelvic limb nerves originating from the plexus was examined. The iliohypogastric nerve arose from L₁ and L₂, giving rise to the cranial and caudal nerves, and the ilioinguinal nerve arose from L₃. The other branch of L₃ gave rise to the genitofemoral nerve and 1 branch from L₄ gave rise to the lateral cutaneous femoral nerve. The trunk formed by the union of L_4-5 divided into medial (femoral nerve) and lateral branches (obturator nerve). It was found that the LSP was formed by all the ventral branches of L₄ at L₆ and S₁ at S₃. At the caudal part of the plexus, a thick branch, the ischiadic plexus, was formed by contributions from L_5-6 and S₁. This root gave rise to the nerve branches which were disseminated to the posterior limb (cranial and caudal gluteal nerves, caudal cutaneous femoral nerve and ischiadic nerve). The ischiadic nerve divided into the caudal cutaneous surae, lateral cutaneous surae, common fibular and tibial nerve. The pudendal nerve arose from S_1-2 and the other branch of S₂ and S₃ formed the rectal caudal nerve. The results showed that the origins and distribution of spinal nerves that constitute the LSP of chinchillas were similar to those of a few rodents and other mammals.

Palavras-chave : anatomy; Chinchilla lanigera; lumbosacral plexus; pelvic limb innervation; posterior limb.

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