| The postcranial skeleton, and especially the vertebrae, carpals and tarsals, were very slow to ossify. |
| The flat bones ossify directly from such fibrous tissue rather than from intermediary cartilage. |
| Because of deep specialization, the scientific enterprise has a built-in tendency to ossify. |
| The mentomecklians do not ossify until approximately the same time that the quadratojugal appears in the upper jaw. |
| Fossilized embryos are rarely discovered, because their bones only begin to ossify late in development. |
| The joint between the incus and stapes is likewise a cartilagenous joint, with a tendency to ossify in older humans. |
