Supplement_S7A

High resolution version of Supplementary Figure 7(a). Figure S7. Thin-sections of smaller right tibia P.5021 (A–C, F), the indeterminate long bone P.5023 (D) and femur P.5023 (E). Image C is in normal transmitted, A, D and E in polarised, and B and F in polarised light using lambda compensator. A, B. Cortical bone showing parallel-fibred bone tissue subdivided by two annuli (marked by arrowheads). C. Higher magnification of the cortical bone. The bone tissue is vascularized by numerous primary vascular canals, which are oriented longitudinally or obliquely. D. Close-up view of the cortical parallel-fibred bone tissue with reticular vascularisation pattern. E. Close-up of cortex with laminar organisation of vascular spaces. F. Remnant of endosteal lamellar bone tissue (marked by arrowheads) surrounding in part the medullary cavity. PC, primary vascular canals; PFB, parallel-fibred bone.

补充图7(a)的高分辨率版本。图版S7：编号P.5021的右侧小型胫骨（A–C、F）、编号P.5023的未定名长骨（D）以及编号P.5023的股骨（E）的骨组织薄片切片。其中图像C采用普通透射光拍摄，A、D、E采用偏振光拍摄，B与F则采用搭载λ补偿器的偏振光拍摄。A、B：皮质骨，可见平行纤维骨（parallel-fibred bone）组织被两个生长环（箭头标注）分隔。C：皮质骨的高倍放大视图，该骨组织由大量纵向或斜向分布的初级血管腔隙（primary vascular canals）供血。D：皮质平行纤维骨组织的特写，其脉管系统呈网状分布模式。E：皮质骨特写，可见脉管间隙呈层状排布。F：部分环绕髓腔的骨内膜板层骨组织残余（箭头标注）。PC：初级血管腔隙；PFB：平行纤维骨。