The evolution and development of the dens of the mammalian axis.
D000818:Animals; D001368:Axis, Cervical Vertebra / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology; D005075:Biological Evolution; D001270:Cervical Atlas / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology; D008322:Mammals; D010163:Paleontology