Medullary bone, a highly mineralized, bony reproductive tissue present in the endosteal cavities of all extant egg-laying birds thus far examined, has recently been reported in Tyrannosaurus rex. ..... alligators .... shows no differences on the endosteal surfaces of the long bones, and no evidence of medullary bone
Do we know anything about the presence or absence of medullary bone in Sauropods, Pterodactyles, or the bird-hip dinosaurs (ducksbills, ceratopsians, etc.)?