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Therefore, we macroscopically described the arteries that comprise the aortic arch, thoracic aorta, and abdominal aorta. Six specimens were used, and their arterial systems filled with red latex before fixation in 10% formaldehyde, and fragments of the <jats:italic>rete mirabile<\/jats:italic> were processed for histological analysis using light and scanning electron microscopy. In these species, the aortic arch had two branches: the brachiocephalic trunk and left subclavian artery. The initial portion of the abdominal aorta presented four different ramifications, besides to the peculiarities of the adrenal, renal, and iliac arteries. Microscopy of the <jats:italic>rete mirabile<\/jats:italic> revealed a muscular artery surrounded by smaller muscular arteries, veins, nerves, and lymphatic tissue joined by connective tissue. Thus, the data obtained have clinical and surgical importance, with applicability in procedures involving vascularization of the thoracic and abdominal organs. We suggest that the <jats:italic>rete mirabile<\/jats:italic> is an efficient thermoregulatory structure because it allows the accumulation of blood and the countercurrent heat exchange, as there is no blood mixing.<\/jats:p>","DOI":"10.1002\/ar.25232","type":"journal-article","created":{"date-parts":[[2023,4,29]],"date-time":"2023-04-29T01:18:35Z","timestamp":1682731115000},"page":"185-197","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Aortic branches and <i>rete mirabile<\/i> of the limbs of two\u2010toed sloth (<i>Choloepus didactylus<\/i>)"],"prefix":"10.1002","volume":"307","author":[{"given":"Natacha Cintia Ferreira","family":"Fernandes","sequence":"first","affiliation":[{"name":"Doutoranda do Programa de P\u00f3s\u2010gradua\u00e7\u00e3o em Sa\u00fade e Produ\u00e7\u00e3o Animal na Amaz\u00f4nia (PPGSPAA)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8979-9338","authenticated-orcid":false,"given":"\u00c9rika","family":"Branco","sequence":"additional","affiliation":[{"name":"Docente do Instituto de Sa\u00fade e Produ\u00e7\u00e3o Animal (ISPA) na Universidade Federal Rural da Amaz\u00f4nia (UFRA) e do Programa de P\u00f3s\u2010gradua\u00e7\u00e3o em Sa\u00fade e Produ\u00e7\u00e3o Animal na Amaz\u00f4nia (PPGSPAA)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elisa Carla Barra","family":"Freire","sequence":"additional","affiliation":[{"name":"Instituto de Medicina Veterin\u00e1ria (IMV), Universidade Federal do Par\u00e1 \u2013 UFPA  Castanhal Par\u00e1 Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andr\u00e9 Luis","family":"de Sousa Nogueira Lima","sequence":"additional","affiliation":[{"name":"M\u00e9dico Veterin\u00e1rio Aut\u00f4nomo  Bel\u00e9m Par\u00e1 Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elane Guerreiro","family":"Giese","sequence":"additional","affiliation":[{"name":"Docente do Instituto de Sa\u00fade e Produ\u00e7\u00e3o Animal (ISPA) na Universidade Federal Rural da Amaz\u00f4nia (UFRA) e do Programa de P\u00f3s\u2010gradua\u00e7\u00e3o em Sa\u00fade e Produ\u00e7\u00e3o Animal na Amaz\u00f4nia (PPGSPAA)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8169-2560","authenticated-orcid":false,"given":"Ellen Yasmin Eguchi","family":"Mesquita","sequence":"additional","affiliation":[{"name":"Universidade da Amaz\u00f4nia  Bel\u00e9m Par\u00e1 Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5668-7911","authenticated-orcid":false,"given":"Ana Rita","family":"de Lima","sequence":"additional","affiliation":[{"name":"Docente do Instituto de Sa\u00fade e Produ\u00e7\u00e3o Animal (ISPA) na Universidade Federal Rural da Amaz\u00f4nia (UFRA) e do Programa de P\u00f3s\u2010gradua\u00e7\u00e3o em Sa\u00fade e Produ\u00e7\u00e3o Animal na Amaz\u00f4nia (PPGSPAA)"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,4,28]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-1-4557-7397-8.00039-6"},{"key":"e_1_2_7_3_1","unstructured":"Albuquerque P. 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