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  • 1
    Electronic Resource
    Electronic Resource
    Development of the Areola in the Early Placenta of the One-humped Camel (Camelus dromedarius): A Light, Scanning and Transmission Electron Microscopical Study (2003)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 32 (2003), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study aimed to elucidate development of the areola in the early dromedary placenta in comparison with that of the pig and mare. Placental tissues from 25 pregnant camels were obtained from Cairo abattoir and prepared for light, scanning and transmission electron microscopy by routine methods. Vascular casts were made by injection of 4 : 1 liquid plastic mixture of mercox and methylmethacrylate. Areolar formation was first observed at 4.5 cm curved-crown-rump CVR length, while by 5–9 cm CVR length, the endometrial surface was uneven and studded with numerous uterine gland openings, where corresponding foetal areolae were barely detectable and the foetal areolar cells were of variable appearance and covered with long microvilli. At 10–13 cm CVR length the uterine gland openings developed irregular folds and the maternal areolar cells showed numerous apical blebs. At 14–29 cm CVR length the foetal areolae showed a great increase in height at the expense of their width. At 30–34 cm (CVR) length the maternal areolae appeared discoid and sharply demarcated from the surrounding inter-areolar tissues and the foetal areolae were rounded to irregular in shape with well-developed areolar rims. The vascular casts showed a widely meshed capillary network on the maternal areola, connecting with the pre- and post-capillary vessels, whereas the foetal side showed a relatively dense capillary meshwork. These studies indicate that the areola in the placenta of the one-humped camel is of the regular type like in the pig, and is poorly vascularized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2003.00465.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tripolar acytokinetic mitosis and formation of feto-maternal syncytia in the bovine placentome: different modes of the generation of multinuclear cells (1999)
    Springer
    Anatomy and embryology 200 (1999), S. 229-237 
    Details
    ISSN: 1432-0568
    Keywords: Key words Placenta ; Trophoblast giant cells ; Polyploidy ; Cow ; Cattle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The vast majority of trophoblast giant cells in the ruminant placenta are binuclear and are believed to derive from mononuclear trophoblastic cells by a single acytokinetic mitosis. There is no satisfactory explanation for the generation of the small proportion of trophoblast giant cells with one, three, or more nuclei. In this light- and electronmicroscopic study of bovine placentomal tissue from the second half of gestation, developmental stages of the trophoblast giant cells are investigated. Large mitotic figures indicate mitotic polyploidization, which is proposed to be due to two subsequent acyto- kinetic mitoses. Tripolar mitoses offer an explanation for the development of trinucleate trophoblast giant cells. Measurements of nuclear volumes in a series of semithin sections revealed that three size classes of trophoblast giant cells occur. The approximately doubling of nuclear volume between each class is thought to reflect different levels of DNA content that result from polyploidization in this cell type. Although trinuclear feto-maternal hybrid cells are the standard outcome of the fusion of binuclear trophoblast giant cells with uterine epithelial cells, some syncytia with at least five nuclei were observed in the uterine epithelium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004290050275
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    Paper (German National Licenses)
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