Placentação em mocós, Kerodon rupestris Wied, 1820

Abstract

Placentation studies in fourteen rock cavy females in different gestation phases were developed. The females were pre-anesthetized associating ketamine chloridrate (15mg/kg) and midazolan (1mg/kg). Soon afterwards, they were anesthetized by isoflurane inhalation in association with oxygen at 100% saturation. After the anesthesia, the surgery allowed to exhibit fetal structures and then data collection was performed. Macroscopically, a discoidal placenta, vitelline sack and the amnion of a transparent aspect and avascular, were identified. Microscopically, the umbilical cord presented two arteries, a vein and the allantoid duct, beyond an artery and a vitelline vein. The placenta showed a relationship between the mesometrium and the uterus and was constituted by lobes delimited by interlobular areas and, peripherically, by an area of marginal syncytium containing places with spongiotrophoblast and gigantic trophoblastic cells. The subplacenta was composed by lobules and by a trophoblast of syncytium and cellular nature. The vitelline sack showed a parietal portion sustained by the Reichert´s membrane and a well-vascularized visceral portion. The placentation studies in rock cavies indicated the presence of a bicornuate uterus, a chorioallantoid discoidal and labirynthic placenta, with a hemochorial placental barrier of hemomonochorial subtype separating the maternal-fetal countercurrent sanguine flow.

Topografia dos vasos sanguíneos arteriais e venosos nos rins de Cavalos Puro Sangue Inglês

“…Although the origin of these elements was not the purpose of this investigation, we recorded double renal arteries in three cases (10%) only in the left kidney, which was not considered by other authors, most likely because they only investigated the number and arrangement of these vessels, facts observed in cavies (OLIVEIRA et al, 2011).…”

“…This pattern will occur in other animal species such as rat (GREENE, 1963), rabbit (BARONE, 1997;MOURA;SANTOS, 2006), and rats of the species Rattus norvegicus (FERNANDES et al, 1981) and for the golden hamster (VILARTA et al, 1982a), mouse (VILARTA et al, 1982b), capybara (SOUZA et al, 1996) and agouti (CARVALHO et al, 2008) and cavies (OLIVEIRA et al, 2011).…”

“…Subsequently, this material was fi xed determined using four concentric circles, where the smallest circle represented the ureter. Aft er delimiting the four territories, it was observed the number and locations of entrance and exit of vessels in the renal hilum (OLIVEIRA et al, 2011).…”

Placentação em roedores da família Cricetidae - Sigmodontinae

“…A placenta vitelina é tida como uma placenta funcional em roedores, sendo de grande importância antes da formação da placenta corioalantóidea, pois é a única estrutura presente no feto com responsabilidade nos processos de trocas entre mãe e feto (OLIVEIRA, 2004). Além disso, está associada a transferência de imunidade passiva da mãe para o feto (BRAMBELL, 1958…”

“…As afrontas ambientais, que podem comprometer o desenvolvimento de modo adverso não podem ser amplamente listadas, estas englobam radiação ionizantes, infecções virais, substâncias químicas orgânicas e inorgânicas (DYCE, et al, 1997 Leiser (1994), Bonatelli, (2001, Rodrigues et al (2003) e Oliveira (2004).…”