Anatomy of the lingual branches of the hypoglossal nerve in Sus scrofa domesticus, L., 1758/Anatomia dos ramos linguais do nervo hipoglosso em Sus scrofa domesticus, L., 1758

• Published in: Acta Scientiarum. Biological Sciences (UEM) 2009, Vol.31 (1), p.97
• Main Authors: Fortes, Patricia Marques, Ferreira, Jussara Rocha, Dias, Alessandra Guerra Chaves, Silva, Rosimeire Alves
• Format: Report
• Language: Spanish
• Subjects: Analysis; Formaldehyde
• ISSN: 1679-9283
• DOI: 10.4025/actascibiolsci.v31i1.772

We studied the ramifications and distribution of the hypoglossal nerve after it penetrated the root of the tongue (36 antimeres) of adult swine (Sus scrofa domesticus, L. 1758) from both sexes slaughtered in a slaughterhouse (metropolitan region of Goiania, Goias State--Brazil). The material was chilled for transportation (4°C); placed in aqueous solution of formaldehyde (7%) for 72 hours; submerged in aqueous solution of nitric acid (15%) for 72 hours; dissected under magnifying glass (RASOR, II-20). The torso and the primary, secondary and tertiary nervous branches were observed in the antimeres (method of BITTENCOURT et al., 1987). We followed the topography of the nerve starting from the posterior mandibular region between the myofascial structures of the mylohyoid and hypoglossal. On the root of the tongue the nerve crosses the lingual artery, becoming medial in relationship to the latter. It subdivides into three orders of dimension towards the superior longitudinal muscle as follows: left antimer, 4 to 13 primary branches, 4 to 21 secondary branches and 0 to 16 tertiary branches; on the right antimer, 8 to 18 primary branches, 3 to 13 secondary branches and 0 to 12 tertiary branches. In 27.59% of the analyzed antimeres, the branches of the hypoglossal nerve established joints with fibers from the lingual nerve of the correspondent antimer. Key words: Sus scrofa domesticus, swine, hypoglossal nerve, lingual branches, nervous system. Estudamos as ramificacoes e distribuicao do nervo hipoglosso apos este penetrar na raiz da lingua (36 antimeros) de suinos (Sus scrofa domesticus, L. 1758) adultos de ambos os sexos abatidos em frigorifico (regiao metropolitana de Goiania, Estado de Goias Brasil). O material foi resfriado para transporte (4°C), fixado em solucao aquosa de formaldeido (7%) por 72h, imerso em solucao aquosa de acido nitrico (15%) por 72h, dissecado sob lupa (RASOR, II-20). Nos antimeros, observou-se o tronco e ramos nervosos primarios, secundarios e terciarios (metodo de BITTENCOURT et al., 1987). Seguimos a topografica do nervo, a partir da regiao retro mandibular, entre as estruturas miofaciais do milohioideo e hipoglosso. Na raiz da lingua, o nervo cruza a arteria lingual, passando a ser medial em relacao a esta. Subdivide-se em tres ordens de grandeza em direcao ao musculo longitudinal superior, como segue: antimero esquerdo, quatro a 13 ramos primarios, quatro a 21 ramos secundarios e zero a 16 ramos terciarios; no antimero direito, oi