Origem e distribuição do nervo isquiático no veado-catingueiro (Mazama gouazoubira)

Abstract

This study aimed to describe the origin and distribution of the sciatic nerve in catingueiro-deer (Mazama gouazoubira). Two animals of the species, obtained post mortem by trampling on the highway, were used for the study meeting the requirements of the Governing Law (1.153/95). By dissection the skin was completely removed and the animals were fixed in aqueous 10% formaldehyde solution. Through dorsolateral access, superficial gluteal muscle, biceps femoris muscle and gluteus medius muscle were cut at their insertion and folded, to view the origin and distribution of the sciatic nerve on both sides of the animals. Images were recorded with a digital camera (Sony a200 Camera, 10.2mpx) and results were described based on Veterinary Anatomical Nomina. The source data of the sciatic nerve in both specimens showed that the nerve originates from the ventral branches of S1 and L6, and could have contribution from S2. After its emergence through the greater sciatic foramen on both the sides, the sciatic nerve supplies branches to gluteus medius muscle, gluteus deep muscle, superficial gluteal muscle, gluteobiceps muscle, biceps femoris muscle, semimembranosus muscle, semitendinosus muscle and gastrocnemius muscle. Near the mid-thigh the sciatic nerve divides into the tibial nerve and common peroneal nerve which innervate the muscles of the distal hind limb. Moreover, the cutaneous nerve flow can cause the common peroneal nerve or tibial nerve. In conclusion, in Mazama gouazoubira specimens studied, the sciatic nerve originated from the ventral branch of spinal L6 and S1, which may or may not have the contribution from S2. In its distribution stem originate the gluteal nerve, the caudal femoral cutaneous nerve and muscular branches, which together innervate the muscles gluteus medius, gluteus deep, superficial gluteal, gluteobiceps, biceps femoris, semitendinosus, semimembranosus, adductor and gastrocnemius. Distally the sciatic nerve bifurcates into the common peroneal and tibial nerve, which innervates the distal hind limb.INDEX TERMS: Sciatic nerve, morphology, Mazama gouazoubira.

Evolutionary aspects on the origin, distribution and ramifications of the ischiadicus nerve in the giant anteater (Myrmecophaga tridactyla)

“…The origin of the ischiadicus nerve in gray brocket was derived from the ventral branches of the sixth (L6) lumbar and first (S1), second (S2), and third (S3) sacral spinal nerves (De Camargo et al, 2008). However, considering the same deer species, Martins et al (2013) described the nerve origin predominantly from the ventral branches of the sixth (L6) lumbar spinal nerve and the first sacral spinal nerve (S1), having in some cases a contribution from the second pair of sacral (S2) spinal nerves.…”

“…The distribution and ramification of the ischiadicus nerve to the semimembranous muscle were observed in gray brocket (De Camargo et al, 2008), wild boar (Iglesias et al, 2011), and giant anteater (Cruz et al, 2013). In addition, the distribution of the nerve was evidenced to the biceps femoris muscle in gray brocket (De Camargo et al, 2008;Martins et al, 2013), and giant anteater (Cruz et al, 2013). The gemelli muscle was innervated by the ischiadicus nerve in gray brocket (De Camargo et al, 2008).…”

Distribuição dos brônquios lobares dos pulmões do veado-catingueiro Mazama gouazoubira

“…Este mamífero de pequeno porte encontra-se também por toda América do sul e na América Central (Duarte 1997). A descrição morfológica desta espécie na literatura ainda é escassa (Tiepolo & Tomas 2006, Lima et al 2010, Ferreira et al 2011, Martins et al 2013) e não foram encontrados estudos que descrevam o sistema respiratório deste animal e o comparem com o de outros ruminantes. Desta forma o objetivo deste estudo foi caracterizar a lobação dos pulmões do veado-catingueiro, contribuindo com dados para futuras pesquisas e abordagens clínico-cirúrgicas deste animal.…”

Origem e distribuição do plexo lombossacral de javali (Sus scrofa - Linnaeus, 1758)

“…Uberlândia-M G, 2016.L6 e, S1 em 32% e, de L6, S1 e S2, em 12,9%. Esta última composição do nervo isquiático foi relatada porMartins et al (2013) em veado-catingueiro (Mazama gouazoubira), assim como também formação de L6 e S1 Ferraz et al (2006),. em fetos de bovinos azebuados, relataram que o nervo isquiático apresenta sua origem a partir dos ramos ventrais de L6, S1 e S2.…”