Fig. 18 in The Os Navicular of Humans, Great Apes, OH 8, Hadar, and Oreopithecus: Function, Phylogeny, and Multivariate Analyses

Fig. 18. Proximal views of the right cuboid and navicular of a human (A) and a common chimpanzee (B) in a close­packed position showing the contribution of the talocuboid angle (v) to the height of the transverse arch (h). In the close­packed position the small angle shown by chimpanzees results in a higher transverse arch than normally seen in humans. The human arch, however, unlike that of chimpanzees, exhibits a fixed height. Owing to a small, irregular, and often absent cuboid facet, the human talocuboid angle could not be accurately measured.