Fig. 5From: 3D shape analyses of extant primate and fossil hominin vertebrae support the ancestral shape hypothesis for intervertebral disc herniationShape variation in the extant first lumbar vertebrae captured by PCs 1 and 2, which account for 22.0% and 15.3% of the variation, respectively. The wireframes illustrate the vertebral shapes described by PC1. The stars indicate where the wireframes are located in the scatter-plotBack to article page