Femur histology of <i>Mussaurus patagonicus</i> MLP 61-III-20-22.

<p>(<b>A</b>) General view of the compact bone. Arrowheads indicate the presence of LAGs in the outer third of the compacta. Normal light. (<b>B</b>) Detailed view of the fibrolamellar bone tissue. Primary bone is interrupted by some secondary osteons. Polarized light with lambda compensator. (<b>C</b>) Detail of the cortical bone showing predominance of parallel fibered bone tissue. Polarized light. (<b>D</b>) Detail of the highly vascualrized primary bone. Vascular canals are exhibits a plexiform pattern. Normal light. (<b>E</b>) Detailed view of the outer cortex showing several LAGs (arrowheads). Note that some secondary osteons are organized in concentric rows. Normal light. (<b>F</b>) Detailed view of the primary bone showing closely spaced LAGs and secondary osteons. (<b>G</b>) Closely spaced LAGs at the outer lateral region. Note the presence of some bundles of Sharpey’s fibers. Normal light. (<b>H</b>) Enlarged view of the cortex showing the presence of abundant secondary osteons developed only in the anterolateral region of the cortex (right half of the image). Normal light. (<b>I</b>) Detail of the most remodeled area of the compacta. Note that interstitial primary bone tissue is still preserved. Polarized light with lambda compensator. Abbreviations: cv: circumferentially oriented vascular canal; mc: medullary cavity; nrp: non remodeled primary bone tissue; po: primary osteon; rc: resorption cavity; rv: radially oriented vascular canal; Sf: Sharpey’s fibers; so: secondary osteon.