Descrição morfológica do plexo braquial de jaguatirica (Leopardus pardalis)

Abstract

ResumoO plexo braquial é constituído por raízes ventrais dos nervos espinhais que se unem para a formação dos troncos nervosos. É geralmente formado por contribuições dos três últimos nervos cervicais e dos dois primeiros nervos torácicos. Devido à escassez de informações relativas à neuroanatomia, objetivou-se buscar a descrição da morfologia macroscópica do plexo braquial da jaguatirica (Leopardus pardalis). Foram utilizados dois exemplares de jaguatirica provenientes da área de Mina Bauxita Paragominas -PA, Brasil/Empresa Terra LTDA, doados após morte por atropelamento ao Laboratório de Pesquisa Morfológica Animal (LaPMA) da Universidade Federal Rural da Amazônia (UFRA), os quais foram fixados em solução aquosa de formoldeído a 10% por via intramuscular. Após fixação os animais foram dissecados, possibilitando a observação e identificação dos ramos ventrais dos nervos espinhais cervicais e torácicos que participaram da formação do plexo braquial. O plexo braquial mostrou-se formado por quatro troncos, os quais originaram os ramos ventrais dos nervos espinhais cervicais C 6 , C 7 e C 8 e do primeiro torácico T 1 . Tais troncos deram origem aos nervos supraescapular, subescapular, musculocutâneo, axilar, radial, mediano, ulnar, toracodorsal e torácico lateral. Palavras-chave: Jaguatirica; Nervos; Plexo braquial AbstractMorphological description of the brachial plexus in ocelot (Leopardus pardalis). The brachial plexus is formed by the ventral roots of the spinal nerves, which unite to form the nerve trunks. It is usually formed by contributions of the last three cervical nerves and the first two thoracic nerves. Due to the scarcity of information on neuroanatomy, this study aimed to determine the macroscopic morphology of the brachial plexus of the ocelot (Leopardus pardalis). In this work, we used two ocelot specimens from the area of the Paragominas Bauxite Mine, PA, Brazil/Empresa Terra LTDA, with permission from SEMA -BP Nos. 455/2009 and 522/2009. The animals were donated to the Research

Brachial Plexus in the Pampas Fox (Lycalopex gymnocercus): a Descriptive and Comparative Analysis

“…This coincides with the most frequent formation (58.62%) of the plexuses of domestic dogs, although the contribution of C5 and/or T2 was also observed by Allam et al (). This formation of the brachial plexus has also been confirmed in the other carnivores for which the brachial plexus has been described: domestic cats (Getty, ; Aubert et al, ), Arctocephalus australis (Souza et al, ), Atelocynus microtis (Pinheiro et al, ), Cerdocyon thous (Souza Junior et al, ) and Leopardus pardalis (Chagas et al, ) and. Without specifying the species, Paterson () reported that in “foxes” only four branches form the brachial plexus, without mentioning which ones, but we assume they are the same ones found in L. gymnocercus since C6, C7, C8 and T1 form the plexus in all mammals studied so far.…”

“…This is in line with the dissections reported by Allam et al () and Getty () as well as the electrophysiological studies of Sharp et al () for domestic dogs. Among carnivores, this same origin has been reported to predominate in domestic cats (Getty, ), L. pardalis (Chagas et al, ) C. thous (Souza Junior et al, 2014b). In one plexus, the nerve originated exclusively from C7, which has also been reported in A. australis (Souza et al, ).…”

“…This reinforces the functional importance of these branches for this nerve in canids. The origin only at C6 (20%) occurs in domestic cats (Getty, ) and Leopardus pardalis (Chagas et al, ). In the pampas foxes studied here, formation by C7 and C8 (5%) occurred in only one limb, something that has not been reported in other species.…”

“…Despite ample morphofunctional knowledge of the brachial plexus of domestic dogs and cats (Allam et al, ; Sharp et al, ; Sharp et al, ; Aubert et al, ), descriptions containing both the origin and distribution of this plexus in wild carnivores still scarce. These are restricted to Ursus maritimus (Matsushima, apud Yoshitomi et al, ), Arctocephalus australis (Souza et al, ), Atelocynus microtis (Pinheiro et al, ), Leopardus pardalis (Chagas et al, ) and Cerdocyon thous (Souza Junior et al, ) and most of these studies are based on dissection of only one or two individuals.…”

Descrição anatômica do plexo braquial de Callithrix jacchus e Callithrix penicillata

“…O nervo torácico lateral (NT) de Callithrix jacchus e C. penicillatae, como também de outros mamíferos, são originados do tronco caudal (C8 e T1) (Scavone et al 2008, Chagas et al 2014.…”