Origem e distribuição do plexo lombossacral da paca (Cuniculus paca, Linnaeus 1766)

Abstract

ResumoConsiderando a importância da paca como fonte proteica alternativa à população e, em especial, por apresentar características adequadas à pesquisa como modelo experimental, objetiva-se descrever a origem e a distribuição do plexo lombossacral da paca, visando colaborar com o melhor conhecimento de sua morfologia, cuja descrição é escassa na literatura. Foram utilizadas oito pacas adultas (Cuniculus paca) de ambos os sexos, provenientes do criatório do Setor de Animais Silvestres da Faculdade de Ciências Agrárias e Veterinárias da Universidade Estadual Paulista (Unesp) em Jaboticabal; após o óbito, os animais foram fixadas em paraformaldeído 10% e dissecadas para identificação do plexo lombossacral. Este, em 7 pacas analisadas (87,5%), originou-se dos ramos ventrais dos nervos espinhais lombares L4, L5, L6 e L7 e dos nervos espinhais sacrais S1, S2 e S3; e em 1 espécime (12,5%) o plexo lombossacral originou-se de L5, L6, L7, S1, S2 e S3, sem a participação de ramo proveniente de L4. Conclui-se que os nervos que contribuem para formação desse plexo são: nervo genitofemoral, nervo cutâneo femoral lateral, nervo femoral, nervo glúteo cranial, nervo obturatório, nervo isquiático, nervo glúteo caudal, nervo pudendo e nervo cutâneo femoral caudal. Palavras-chave: Anatomia; Animais silvestres; Inervação; Membro pélvico; Roedor AbstractOrigin and distribution of the lumbossacral plexus in lowland paca (Cuniculus paca, Linnaeus 1766). Considering the importance of lowland paca as an alternative protein source to the population and, especially, for showing suitable characteristics for research as an experimental model, we aim to describe the origin and distribution of the lumbossacral plexus in lowland paca, in order to contribute to an improved knowledge on its morphology, whose description is poor in literature. Eight adult lowland pacas (Cuniculus paca) of both sexes were used, obtained from the breeding ground at the Wild Animals Sector of the School of Agricultural and Veterinary Sciences of the São Paulo State University (UNESP) in the town of Jaboticabal; after death, the animals were fixed in 10% paraformaldehyde and dissected for identifying the lumbossacral plexus. This, in 7Biotemas, 27 (2): 157-162, junho de 2014 ISSNe 2175-7925 http://dx

Origin and Antimeric Distribution of the Femoral Nerves in New Zealand Rabbits

“…This formation resembles that of the porcupine (T15, L1-L3) (Aydin), and differs from that observed in rabbits of this study. Oliveira et al (2008) observed that in the cavy (Galea spixii), the femoral nerve originated from the ventral roots of L5 and L6, similar to that observed by Tonini et al (2014) in the paca (Cuniculus paca) and partly similar to the results found in the present investigation. Martinez-Pereira & Rickes (2011) observed that in the chinchilla (Chinchilla lanigera), the femoral nerve originated from the ventral roots of L4 and L5, in part similar to the results found in the present investigation (only in males).…”

Lumbosacral plexus of the mongolian gerbil(Meriones unguiculatus Milne-Edwards, 1867)

“…However, results differed from those in the chinchilla (MARTINEZ-PEREIRA; RICKES, 2011) derived exclusively from L 3 , and in the paca (TONINI et al, 2014) derived exclusively by L 4 .…”

“…The nerve in the red squirrel (AYDIN, 2010) derived from L 3 and demonstrated a nerve arrangement different from that of the gerbil. The cutaneus femoris lateralis nerve has a similar formation as that of the anteater (CRUZ et al, 2014), differing from reports on the chinchilla (MARTINEZ-PEREIRA; RICKES, 2011) formed exclusively from L 4 , and on the paca (TONINI et al, 2014) derived from L 5 .…”

“…They also differed from those on the paca (TONINI et al, 2014), formed from L 4 -S 3 ; from those of the rock cavy (LACERDA et al, 2006) and Spix's yellow toothed-cavy (OLIVEIRA et al, 2014) derived from L 5 -S 3 . Difference may be related to the acquisition of morphological characteristics throughout the evolution process which may have differentiated the cavid from the murid rodent groups or they may be related to such behavior as great agility, greater capacity for cramming, climbing trees or jumping.…”

“…The literature (LOPES et al, 2012;OLIVEIRA et al, 2014;TONINI et al, 2014) describes the lumbosacral plexus as a structure formed by the interaction between the lumbar and the sacral plexuses, generally made up of nerve roots derived from the last lumbar vertebra and from the first sacral vertebra, innerving the pelvis and the region´s viscera.…”