Morphological description of smell glands in Cyclopes didactylus.

A macroscopic and microscopic study of the mandibular organ of the silky anteater (Cyclopes didactylus) was carried out. The organ extends from below the zygomatic bone line to the middle of the mandible body, between the skin and the masseter muscle, on both sides of the animal. It has an average length of 11.7 mm and a width of 6.3 mm. In the mesoscopic analysis, it was observed that the organ presents in yellowish color due to the high amount of sebaceous content. In the histological analysis, the mandibular organ was observed to be composed of innumerable alveoli of the specialized sebaceous gland, surrounded by a layer of adventitia tunica. Scanning electron microscopy (SEM), revealed an apparent alveolar division with what appeared to be a sulcus at its center. The information here presented regarding the constitution and location of this structure has not been previously explored for other species and differs with respect to other descriptions for anteaters. Based on the present study, it is suggested that the mandibular organ is involved in social interaction in this species.

Ramos colaterais do arco aórtico e suas principais ramificações no cachorro-do-mato (Cerdocyon thous) / Collateral branches of the aortic arch and its main rami in crab-eating fox (Cerdocyon thous)

O cachorro-do-mato (Cerdocyon thous) pertence à família Canidae, encontra-se amplamente distribuído pela América do Sul. Devido à escassez literária a respeito da morfologia desta espécie objetivamos colaborar com o conhecimento da anatomia do arco aórtico e seus ramos colaterais. Foram estudados quatro animais, sendo 2 machos e 2 fêmeas oriundos da Mina de Bauxita, Paragominas, Pará, Brasil/Terra Ltda, sob autorização da SEMA-PA nº 455/2009, que morreram por causas naturais. O sistema arterial foi preenchido com látex corado em vermelho e fixado em solução aquosa de formoldeído 10%. O arco aórtico de Cerdocyon thous apresentou em sua origem apenas dois vasos, o tronco braquiocefálico e a artéria subclávia esquerda. Do tronco braquiocefálico originou-se o tronco bicarotídeo, que se bifurcou nas artérias carótidas comum direita e esquerda, e artéria subclávia direita. Das artérias subclávias ocorreu a formação do tronco costocervical, artéria vertebral, artéria torácica interna, artéria cervical superficial e ao atingir o espaço axilar passa a ser chamada de artéria axilar em ambos os antímeros. Concluímos que o arco aórtico de Cerdocyon thous é similar ao de outros animais domésticos com relação ao número de ramificações em sua origem.(AU)

Crab-eating fox (Cerdocyon thous) belongs to the Canidae family distributed in South America. Due to literary scarcity regarding the morphology of this species, we objectifiked to collaborate with description of the anatomy of the aortic arch and its collateral branches. We studied four foxes, 2 males and 2 females, from Mina Bauxita, Paragominas, Pará, Brazil/Terra Ltda, under authorization of SEMA-PA nº 455/2009, that died of natural causes. The arterial system was filled with red latex and fixation with 10% formaldehyde solution. The aortic arch of Cerdocyon thous showed that in its origin are two vessels, brachiocephalic trunk and left subclavian artery. From brachiocephalic trunk originates the bicarotid trunk, bifurcated into left and right carotid common arteries, and right subclavian artery. The subclavian arteries originates the costocervical trunk, vertebral artery, internal thoracic artery, superficial cervical artery, to reach the axillary space, and passes to be called axillary artery on both sides. We conclude that the aortic arch of Cerdocyon thous is similar to the one in other domestic animals regarding the number of ramificastions at its origin.(AU)