 The diploë in a dried calvaria is not red because
the protein was removed during preparation of the cranium.The internal table of bone is thinner than the external table, and in some areas there is only a thin plate of compact bone with no diploë.Calvarial bones are supplied by endosteal and periosteal sheaths which are innervated by the nociceptors, sensory, sympathetic, and parasympathetic nerves.