Structural changes to the uterus of the dwarf ornate wobbegong shark ( Orectolobus ornatus ) during pregnancy,Journal of Morphology

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Structural changes to the uterus of the dwarf ornate wobbegong shark ( Orectolobus ornatus ) during pregnancy
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-02-07 , DOI: 10.1002/jmor.21109
Alice L Buddle ₁ , Nicholas M Otway ₂ , James U Van Dyke ₃ , Michael B Thompson ₁ , Christopher R Murphy ₄ , Samson N Dowland ₄ , Colin A Simpfendorfer ₅ , Megan T Ellis _{2,

6} , Camilla M Whittington ₁

Affiliation

Embryos of the viviparous dwarf ornate wobbegong shark (Orectolobus ornatus) develop without a placenta, unattached to the uterine wall of their mother. Here, we present the first light microscopy study of the uterus of O. ornatus throughout pregnancy. At the beginning of pregnancy, the uterine luminal epithelium and underlying connective tissue become folded to form uterine ridges. By mid to late pregnancy, the luminal surface is extensively folded and long luminal uterine villi are abundant. Compared to the nonpregnant uterus, uterine vasculature is increased during pregnancy. Additionally, as pregnancy progresses the uterine epithelium is attenuated so that there is minimal uterine tissue separating large maternal blood vessels from the fluid that surrounds developing embryos. We conclude that the uterus of O. ornatus undergoes an extensive morphological transformation during pregnancy. These uterine modifications likely support developing embryos via embryonic respiratory gas exchange, waste removal, water balance, and mineral transfer.

中文翻译：

怀孕期间侏儒华丽沃贝贡鲨鱼（Orectolobus ornatus）子宫的结构变化

胎生侏儒华丽 wobbegong 鲨鱼 (Orectolobus ornatus) 的胚胎在发育时没有胎盘，不附着在母亲的子宫壁上。在这里，我们展示了整个怀孕期间 O. ornatus 子宫的第一次光学显微镜研究。在怀孕初期，子宫腔上皮和下面的结缔组织折叠形成子宫嵴。到妊娠中晚期，管腔表面广泛折叠，长管腔子宫绒毛丰富。与未怀孕的子宫相比，怀孕期间子宫血管系统增加。此外，随着妊娠的进行，子宫上皮细胞会变细，因此将母体大血管与发育中胚胎周围的液体分开的子宫组织很少。我们的结论是 O 的子宫。ornatus 在怀孕期间经历了广泛的形态学转变。这些子宫改造可能通过胚胎呼吸气体交换、废物清除、水平衡和矿物质转移来支持发育中的胚胎。

更新日期：2020-02-07

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