intramembrous ossification

https://doi.org/10.1351/goldbook.10861

Creation of bone tissue during fetal development of jawed vertebrates, as well as during the healing of bone fractures; the tissue forms from mesenchymal stem cells residing in an extracellular matrix devoid of collagen.

Note: Intramembrous ossification is one of two mechanisms of bone formation, the other being endochondral ossification.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 770 [Terms] [Paper]