Estudo morfológico dos órgãos genitais masculinos do guaxinim (Procyon cancrivorus)

Abstract

Foram utilizados três animais, sendo um proveniente da Universidade de São Paulo e dois encaminhados pelo IBAMA (Proc. 02027.000.286/2004-92), excedente populacional de zoológico. Os aparelhos reprodutores masculinos "ex situ" foram fixados por imersão e dissecados. Foram retirados fragmentos de cada órgão e glândula anexa do aparelho reprodutor, os quais foram processados e incluídos pelas técnicas de inclusão em paraplast. Cada bloco foi cortado e os cortes foram corados por HE, picrosírius, reação de PAS com fundo de hematoxilina e tricromo de masson para a observação das estruturas ao microscópio óptico. Macroscopicamente, a região inguinal era composta pela uretra, músculo isquiocavernoso, músculos bulboesponjoso e bulbo cavernoso, músculo retrator do pênis, um par de testículos e o osso peniano ou báculo e ânus. A glande do pênis apresentou uma dilatação proximal (bulbo da glande) constituída pela parte dilatada do báculo. A posição dos testículos, dentro do escroto, era horizontal. A próstata apresentou-se com formato globoso, circundando a uretra. Microscopicamente, os testículos eram envoltos por uma cápsula de tecido conjuntivo denso, a túnica albugínea testicular. O ducto epididimário era provido de um epitélio pseudoestratificado com estereocílios. A uretra peniana apresentou-se circundada pelo corpo esponjoso e no restante do pênis apresentou o corpo cavernoso (tecido erétil). Os resultados macro e microscópicos encontrados até o momento são semelhantes aos achados no Canis familiaris (cão doméstico).

Morphology of the male reproductive tract of Eira barbara

“…Structures inherent to the secondary bone tissue were observed, such as the organization of collagen fibers in lamellae, characteristic of long bones, with Haversian systems closely connected to Volkmann channels (Banks, 1992; Junqueira and Carneiro, 2015) in addition to evidence of the organ's characteristic eosinophilia. The findings regarding the presence of the baculum are similar to those of Martucci et al (2011) and as expected when comparing the microstructure to those of canine and domestic feline baculums, as well as some rodent species, although the spoon shape was a unique finding (Rocha‐Barbosa et al, 2013). The baculum was found microscopically in Micomarcai but non‐ossified (Siqueira et al, 2018).…”

“…Its distal end is rounded, with a small "C" shaped border. It does not diminish distally as Dyce et al (2010) described in the dog, nor does it present alter shapes as described in raccoons and coatis by Martucci et al (2011) andFranciolli et al (2007).…”

“…Similar findings were also observed by Martins (2005). The ampoule of the deferens duct in irara was coated with simple prismatic epithelium and acinar conformity, different from that described for the raccoon ampoule, which featured a pleated epithelium and an ampoule formed by the dilation of the deferens duct (Martucci et al, 2011).…”

“…The raccoon ( Procyon cancrivorus ) penis also has a baculum that is distally bilobed in the form of vertical changes relative to the animal's body. The cranial end of the penis is terminated by a thin triangular glans lining the bone (Martucci et al, 2011). Another representative of the Procyonidae family, the coati ( Nasua nasua ), also has a bilobed penile bone with rounded distal portions in the shape of an alter (Franciolli et al, 2007).…”

Urogenital development and sexual differentiation in males of the species Dasyprocta fuliginosa

“…Histologically, the testicular parenchyma was composed of convoluted tubules, the seminiferous tubules that presented germinal epithelium. These structures were surrounded by non‐modelled dense connective tissue and loose connective tissue septa that converged towards the centre and formed the testicular mediastinum, such characteristics corroborate what has already been described in the histological literature (Banks, 1992; Junqueira & Carneiro, 2008) and already described for D. prymnolopha (Menezes et al, 2017), D. leporina (Costa et al, 2010), Agouti paca (Borges et al, 2013; Costa et al, 2010) and crab‐eating raccoon ( Procyon cancrivorus ) (Martucci et al, 2011).…”