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Novel insight into the origin of the growth dynamics of sauropod dinosaurs

Fig 5

Femur histology of Massospondylus carinatus BP/1/4934.

(A) General view of the compact bone. Note the extensive secondary remodeling in the inner half of the compacta. Several LAGs are observed in the primary bone tissue (arrowheads). Normal light. (B) Primary bone tissue at the outer cortex. Some degree of birefringence is evident in the matrix. Polarized light. (C) Detailed view of the primary bone tissue showing primary osteons and strongly flattened osteocyte lacunae. Normal light. (D) Detail of the mid cortex showing predominance of fibrolamellar bone tissue. Polarized light with lambda compensator. (E) Enlarged view of the primary bone showing variation in the shape of the osteocyte lacunae shape and their arrangement. The bone matrix is interrupted by a single LAG. Normal light. (F) Detail of secondary osteons and Sharpey’s fibers. Normal light. (G) Primary bone at outer cortex interrupted by LAGs. Normal light. (H) Detailed view of the inner cortex showing abundant secondary osteons. Normal light. Abbreviations: pfb: parallel fibered bone; po: primary osteons; Sf: Sharpey’s fibers; so: secondary osteons; wfb: woven fibered bone.

Fig 5

doi: https://doi.org/10.1371/journal.pone.0179707.g005