Cerda Ignacio A, Chinsamy Anusuya, Pol Diego
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917 (C1033AAJ), Ciudad Autónoma de Buenos Aires, República Argentina; Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Museo Carlos Ameghino, Belgrano 1700, Paraje Pichi Ruca (predio Marabunta), Cipolletti, Río Negro, Argentina.
Anat Rec (Hoboken). 2014 Aug;297(8):1385-91. doi: 10.1002/ar.22954. Epub 2014 May 26.
Mussaurus patagonicus (Dinosauria: Sauropodomorpha) is a basal sauropodomorph from the Late Triassic of southern Argentina that is known from a large number of individuals, including juveniles, subadults, and adults. Here, we report on the occurrence of an unusual bone tissue in an individual of M. patagonicus. The rather atypical bone tissue is located within the femoral medullary cavity and also occurs within several erosion cavities of the midinner part of the cortex. This tissue is well vascularized and is composed of a matrix that consists of abundant and densely packed osteocyte lacunae. Although some features of this tissue resembles avian medullary bone, the histological features are distinctive and share more features with the pathological, reactive bone produced in extant birds in response to a retrovirus-induced disease (avian osteopetrosis). Here, we also discuss and provide histological features to effectively differentiate endosteally formed medullary bone from pathological avian osteopetrosis.
巴塔哥尼亚鼠龙（恐龙纲：蜥脚形亚目）是一种来自阿根廷南部晚三叠世的基础蜥脚形亚目恐龙，已知有大量个体，包括幼年、亚成年和成年个体。在此，我们报告了在一只巴塔哥尼亚鼠龙个体中发现的一种不寻常的骨组织。这种相当不典型的骨组织位于股骨骨髓腔内，也出现在皮质中部内侧的几个侵蚀腔内。该组织血管丰富，由一种基质组成，该基质包含大量紧密排列的骨细胞陷窝。尽管这种组织的一些特征类似于鸟类的骨髓骨，但其组织学特征独特，与现存鸟类因逆转录病毒引起的疾病（禽骨质石化症）产生的病理性反应骨有更多共同特征。在此，我们还讨论并提供了组织学特征，以有效区分骨内膜形成的骨髓骨与病理性禽骨质石化症。
