Morfologia do ovário da ema (Rhea americana)

Abstract

RESUMO.-A morfologia do ovário de emas adultas (Rhea americana) sexualmente maduras foi descrita neste trabalho. Os ovários de 24 fêmeas em fase reprodutiva foram colhidos em abatedouro, tomados dados métricos do diâmetro dos folículos (n = 18) e colhidos fragmentos para microscopia de luz (n = 6) fixados em formol 10%, PBS 0,1M, pH 7,4 para microscopia de luz. Nas emas o ovário esquerdo está desenvolvido, ocupando a porção dorsal da cavidade celomática em contato com a porção cranial do rim esquerdo e a glândula adrenal esquerda, sustentado na cavidade pelo mesovário. Na superfície livre do ovário foram observados em média 72,4±17,09 folículos em desenvolvimento e 30,4±3,65 folículos atrésicos. Os folículos estão unidos à superfície ovariana pelo pedúnculo folicular e os em desenvolvimento apresentam uma cinta na superfície, o estigma folicular, rompida nos folículos atrésicos. Histologicamente, o ovário possui uma medula, com tecido conjuntivo frouxo e vasos sangüíneos e um córtex repleto de oócitos e folículos, cuja parede está constituí-da pelas tecas externa e interna, estrato granuloso e zona radiada. No córtex observam-se folículos primordiais, pré-vitelogêni-cos e vitelogênicos. A superfície do ovário está revestida por epitélio cúbico baixo, o epitélio germinativo, o qual está sobre o tecido conjuntivo da túnica albugínea. As características morfológicas do ovário da ema são resultado do tamanho do ovo produzido e em geral semelhante ao de outras espécies de aves. The ovarian morphology of the sexually mature rhea (Rhea Americana) is described. Ovaries from 24 adult rheas in their reproductive age were collected in the slaughterhouse. Follicular diameters (n = 18) were measured and samples (n = 6) were fixed in 10% formaldehyde with 0.1M phosphate buffer at pH 7.4 for light microscopy. Results showed that the left ovary occupied the dorsal portion of the celomatic cavity in contact with the cranial portion of the left kidney and the suprarenal gland, being supported in the cavity through the mesovary. On the free surface of the ovary 72.4±17.09 follicles in different phases of development and 30.4±3.65 atretic follicles were observed. The follicles were linked to the ovarian surface by the follicular stalk and had a wide band surrounding its surface, the Stigma folliculare. Histologically, the ovary is constituted by a medulla, composed by connective tissue and vessels, and by a cortex with oocytes and follicles. The follicular wall is composed by the Theca externa and Theca interna, Stratum granulosum and the Zona radiata. The ovary surface is covered by a cubic epithelium, the germinal epithelium, on the connective tissue of the Tunica albuginea. The morphologic characteristics of the ovary of the rhea are due to the egg size in this species and generally similar to other birds.

Morphological aspects of the ovaries of turtle Kinosternon scorpioides raised in captivity

“…Moreover, the decreasing proportion in the number of small, medium and large follicles was maintained in all animals examined (Table 2). Parizzi et al (2007) afϐirmed the existence of signiϐicant differences (p<0.05) in the number of follicles (small, medium and large) in the ema (Rhea americana) ovaries. However, in jurara this difference was only observed between small and medium, and also, small and large follicles (p<0.01).…”

Detection of Candida species resistant to azoles in the microbiota of rheas (Rhea americana): possible implications for human and animal health

“…), emu ( Dromaius novaehollandiae ) and kiwi ( Apteryx australis ). The species is native to South America and is found in the wild in many regions of Brazil, despite threats from hunting and habitat destruction (Parizzi et al , 2007; Soares et al , 2010; IUCN, 2012). Rheas are omnivorous, feeding on many plant species, small rodents, reptiles and insects.…”

Reproductive biology, morphology, and morphometry of ovaries and oviducts of Trachemys scripta elegans in Brazilian Cerrado

“…Morphology and distribution of primary, secondary and tertiary follicles were similar to K. scorpioides (Chaves et al 2012), with the primary follicles being close to blood vessels and some dispersed in the stroma, while in E. imbricata these are distributed randomly in the cortex (Pérez-Bermúdez et al 2012). The constitution of the wall of the tertiary follicles, formed by external theca, internal theca, granular layer with perivitelline membrane and radial zone with vitelline membrane did not diverge from K. scorpioides (Chaves et al 2012); snakes (Almeida-Santos 2005) and ema (Parizzi et al 2007).…”