The exploration and quantitative analyses of inner craniodental features is relevant for assessing how many species co-existed with our ancestors and how did they live and evolve. In particular, high-resolution acquisitions may provide crucial information about the inner structure of teeth which might be used for fossil hominin taxonomy, but also hominin brain evolution, as cerebral imprints could be preserved in the inner surface of the cranium, or even the vascular system enclosed by the spongious bone in the cranial vault. In this context, we are requesting permission to scan the skull of StW 573, the oldest and most complete South African Australopithecus specimen, on I12-JEEP at Diamond Light Source for X-ray imaging and on IMAT at ISIS for neutron imaging (both approved by the Diamond Light Source access panel: Joint Diamond/ISIS Facility Proposal 21344).