Determinação de acesso cirúrgico para osteossíntese em membro torácico de Bradypus variegatus.

Abstract

The ohjective of this study was the determination of surgical accesses for osteosynthesis of the diaphyses of the humerus, radius and ulna ofBradypus variegates. Seven specimens of B. variegatus that died due to natural causes from the Museu Paraense Emílio Goeldi located in Belém - PA, were donated to the Animal Morphological Research Lahoratory (LaPMA) of the Federal Rural University of Amazônia (UFRA). After the radiographs were taken, three animais were submitted to dissection of the common carotid artery for the injection of Neoprene látex stained with Suvinil Red Chess, which were then fixed using a 10% aqueous formaldehyde solution. One animal was submitted to the maceration process, and two were used for dissection soon after thawing. The muscles of the thoracic limb were identified, as well as the most important vessels and nerves, for determination of adequate surgical accesses and better bone arca for fixation of internai implants. The muscles identified in the B. variegatus arm were: large dorsal, coracobrachial, lateral head of triceps brachii, long head of triceps brachii, tensor of forebrachial fascia, brachioradialis, short head of biceps brachii and long head of biceps brachii. The muscles observed in the forearm were: brachioradial, extensor, common digital extensor, lateral digital extensor, long abductor of the first finger, carpoulnar extensor, round pronator, flexor carpalradial, long palmar, deep digital flexor and flexor carpoulnar. In B. variegatus, surgical access to the humeral shaft can be performed by lateral approach, from the incision of m. triceps brachii lateral head, for fixation of the implant on the lateral side of the bone. Surgical access to the radius shaft can be performed by craniolateral approach, by incising the muscular fascia and separation of the cranially m. common digital extender, and lateral digital extender caudally. And in the ulna, a caudal approach to the bone can be performed followed by release of the insertion m. flexor carpoulnar for placement of the internai implant on the lateral bone face.