张氏西峡爪龙(兽脚类：阿尔瓦雷斯龙类)第二跖骨的骨组织学及其对“窄足型”足部结构发育的启示

秦子川, 赵祺, 徐星

Metatarsal II osteohistology of Xixianykus zhangi (Theropoda: Alvarezsauria) and its implications for the development of the arctometatarsalian pes

QIN Zi-Chuan, ZHAO Qi, XU Xing

Fig. 3 Microphotograph of the ground section II of metatarsal II of Xixianykus zhangi (XMDFEC V 0011) under polarized light A. whole cross section under polarized light;B. Sharpey’s fibers can be seen in the lateroventral corner of metatarsal II (indicated by the black arrows);C. sparsely distributed Sharpey’s fibers on the lateral side of metatarsal II (indicated by the small black arrows)