Descrição do plexo braquial do bicho-preguiça Bradypus variegatus Schinz, 1825 (Mammalia: Pilosa)

Abstract

The species of Bradypus variegatus is known as common sloth. It is an endemic mammal of Neotropical regions, which suffers from devastating human action. These Bradipodids were submitted to the three thoracic and pelvic, consecrated arboreal and descend to the ground only to excrete and change trees. The study had as its origin the brachial plexus of B. variegatus in relation to the origin and distribution of the nerves. For this, 10 adult females were used. A sós were carried out in the Anatomy Pavilion of the Department of Morphology and Physiology of the Animals of the Federal Rural University of Pernambuco, under license nº 034/2015 of the Ethics Committee on the Use of Animals. The corpses were preserved after natural death, fixed at 20%, preserved in 30% solution in tanks and dissected to visualize the nerves destined to innervate the limbs and thoracic muscles. Once done, which is the brachial plexus of the common laziness originates from the fifth cervical segment, and is tracing to the second thoracic segment. It is formed by the long and suprascapular thoracic nerves, of immediate origin of the medial segment 5 and 6, and by the pectoral, subscapular, axillary, radial, musculocutaneous, medial, medial cutaneous nerves of the forearm and ulnar, with the effect of a trunk formed from of cervical spinal nerves (C) 7, C8, C9, and thoracic (T) 1 and T2. Compared with other animals, the wild rays and rays of light relative to the origin of the B. variegatus plexus, however, the constituent nerves and their innervation areas were not discrepancies.